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Old April 12th, 2013, 05:40 PM   #41 (permalink)
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dont expect much of a power gain from a catback on our cars...maybe 1 more horse and 1 more pound of torque...have the exhaust shop cut off immediately where the main cat ends and put 2.25" piping all the way to ur brand new performance muffler...i highly reccomend a small magnaflow
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Old April 12th, 2013, 09:15 PM   #42 (permalink)
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dont expect much of a power gain from a catback on our cars...maybe 1 more horse and 1 more pound of torque...have the exhaust shop cut off immediately where the main cat ends and put 2.25" piping all the way to ur brand new performance muffler...i highly reccomend a small magnaflow
alright thats what i thought you meant, just wanted to clarify tho. and yeah im not expecting anything amazing just give a little breathing room with some sound. thanks man
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Old April 12th, 2013, 10:07 PM   #43 (permalink)
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My .2 cents is that I found a nice gain in performance wise by replacing the stock muffler with one that had a straight through design, and coupled with a cat-delete.
Car runs a lot smoother now without those restrictions. The cat is filled almost full with the honeycomb material.
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Old April 13th, 2013, 08:08 AM   #44 (permalink)
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My .2 cents is that I found a nice gain in performance wise by replacing the stock muffler with one that had a straight through design, and coupled with a cat-delete.
Car runs a lot smoother now without those restrictions. The cat is filled almost full with the honeycomb material.
I don't think I'd pass any emissions or inspections without a cat atleast present. Think I'd get a similar effect with the magnaflow racing cat? I think that's the one that's available, I'd imagine it wouldn't be as good as catless but maybe have a close enough similar effect? That would be something I'd think about doing down the road at sometime if its somewhat similar.
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Old April 13th, 2013, 10:21 AM   #45 (permalink)
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I think you would get close to similar, though I have never seen the inside of a Magnaflow cat...
If you did want to go that route, I have a 25% coupon that was emailed to me. I think it is still good, and I will never use it.
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Old October 18th, 2013, 02:18 PM   #46 (permalink)
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Ok guys so I need help. I bought a $60 cf muffler off ebay, I'm wanting to do a custome exhuast. Bamboost told me I need to get a magnaflow resonators to get a more angry sound. I've been searching for about an hour now and I have acouple questions:
1. I know where the resonator is located under the car, but what is its purpose?
2. What size would I need to buy? 14' 18" or 22"?
3. Is magnaflow the only one that makes on for my GS?
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Old October 18th, 2013, 02:39 PM   #47 (permalink)
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theres a 14" resonator already present...so get an 18".

the purpose is exactly what it sounds like..."resonates sound"....deepens, smooths sound out..
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Old May 7th, 2016, 12:11 PM   #48 (permalink)
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I'm interested in the Injen catback for my GT seeing as how it comes with a high flow cat and doesn't require any chopping of the original piping. However, that 3" diameter has me a little concerned. I have no plans on adding forced induction, is this exhaust too big for NA?
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Old May 7th, 2016, 04:57 PM   #49 (permalink)
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I believe it utilizes stock piping until it gets to the tip, which will be 3 in. If it does not, you need to make sure all of your piping is the same size, other wise, you will get a rasp, or farting sound. The reason is the air going from little to big (or vice versa) flows up, back around, and back down - hitting the air flowing normally to the end of the exhaust - where the size difference is, causing turbulence that can be heard.
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Old May 7th, 2016, 06:10 PM   #50 (permalink)
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GT stock piping diameter is claimed to be 2.388", 3" may be a bit too big for a naturally aspirated V6 engine (2.5" is supposedly ideal). However, this is based on what I've been told and not on hard research, nor do I fully understand flow mechanics and if back pressure is a real issue or not. Worst case scenario, you may actually lose power/response with such a large diameter exhaust.

I upgraded to a 2.25" catback on my 2.2 G5 and it worked very well (GMPP)
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Old August 22nd, 2016, 02:40 PM   #51 (permalink)
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how would u put duals on a gs
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Old August 23rd, 2016, 12:06 PM   #52 (permalink)
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Y pipe and cut your rear bumper. It wouldn't be a true dual. It would mainly be for looks.
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Old May 17th, 2017, 10:17 PM   #53 (permalink)
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This guy clames to get 20 to 25 horses out of this exhaust witch I have a hard time believeing what do you guy think?

http://m.ebay.com/itm/FOR-06-08-ECLI...257Ciid%253A18
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Old May 18th, 2017, 09:23 AM   #54 (permalink)
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Not possible. Also stick with a well known name brand. That is an eBay specific brand which could potentially be decent sounding, but will likely end up ricey and raspy as hell.
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Old May 18th, 2017, 11:41 AM   #55 (permalink)
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This guy clames to get 20 to 25 horses out of this exhaust witch I have a hard time believeing what do you guy think?

FOR 06-08 ECLIPSE 4G 3.8 6G75 STAINLESS CATBACK EXHAUST PIPE 4"SLANT MUFFLER TIP | eBay
Sure if you like rusted pipes that sound like garbage and break after 5k miles
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Old May 18th, 2017, 11:49 AM   #56 (permalink)
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Sure if you like rusted pipes that sound like garbage and break after 5k miles
Well these do look better than the DNA exaust. They actually use a good type of stainless steel so who knows it could be am okay buy
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Old May 18th, 2017, 02:16 PM   #57 (permalink)
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It looks like a cat delete, resonator delete, and high flow muffler... The pipe diameter stays the same. It would be a lot cheaper just to get that exhaust made for you at a shop. But you may want to go 2.5" or 2.75". 3" if you plan on doing a lot of power mods and don't mind losing the low end
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Old May 21st, 2017, 05:59 PM   #58 (permalink)
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Thanks guys I'm not planing on doing alot of mods. I have a cold air intake and want to make the throttle body a bit bigger and port and polish my intake manifold and getting a AEM tuner that about it. Turbo cost too much and you know what that means new pistons and rods it too much work and costly for me. So all just go with an exhaust that not much bigger then what we have already and I know a guy that make exhaust for a living and I know a guy that I can buy pipe from so I think all just go that rout. It my not look shiny crome like but it will do it job not like people can look under my car to find out lol. Thank again guys.
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Old September 8th, 2017, 10:28 PM   #59 (permalink)
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Hey guys, Long story cut really short, Bought a used Eclipse 3 years ago, Love the car. Fixed a small crack in my flex pipe so I could pass inspection. Car is now very quiet and I am trying to regain the medium amount of volume I had before the repair. I have a small budget, so I was thinking an axle-back exhaust with a medium sound rating. Does this sound correct?
This would be my first performance mod (a tiny one at that). Just want to make sure I get my facts straight before I buy the part. also don't want to sound ricey. any thoughts?
Thanks in advance for your experience!
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Old September 9th, 2017, 12:56 AM   #60 (permalink)
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I would spring for the cat-back, I mean RRE sells them for 390$, but with shipping I got out at 455$USD, little bit more pricey but why pay 300$ for a muffler? lol
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Old September 9th, 2017, 10:49 PM   #61 (permalink)
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Thanks, I appreciate the feedback I will look up some of those, $400 is a bit more than i want to spend though so I may be limited to axlebacks for now.. I found a few nice ones for $150
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Old September 9th, 2017, 11:47 PM   #62 (permalink)
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Don't buy a cheap leaky muffler, but you also don't need to buy something bolt on. You could buy a muffler and weld it on yourself, or get a welder to do it for you for less than you'd spend on a pre made kit
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Old September 10th, 2017, 12:42 AM   #63 (permalink)
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@Sabertooth haha dont worry i wasnt looking at any ebay ones...I was looking at the Greddy Revolution rs. Its 2.5 inch inlet 4 inch outlet...5 star reviews and $133
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Old January 24th, 2019, 10:58 PM   #64 (permalink)
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2019 and this post is freaking great. Thank's Mike!
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Old September 26th, 2019, 03:18 PM   #65 (permalink)
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Im not sure if anyone still talks on this forum, but I just picked up an 09' GS, and i was wondering if i could do a cutout before the "3rd" cat, onto a straightpipe that went onto the left side where I would have a GT rear bumper..

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Old September 26th, 2019, 07:26 PM   #66 (permalink)
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Sure can. You can do anything with this car if you're willing to follow through.

Warning though, cut outs leak when cold. They sound awful when not driving too
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Old January 15th, 2020, 11:18 AM   #67 (permalink)
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Thank you for this post the pics are great been looking for pic of the exact placement of these sensors. Could you or anybody on this thread tell me which sensor is the OBD codes referring to P0241 & P0051? I am alos changing the spark plus to double-platinum and installing spark plug nonfouler. I did read that P0241 has something to do with fouled spark plug is that true?
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Old January 15th, 2020, 02:16 PM   #68 (permalink)
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Thank you for this post the pics are great been looking for pic of the exact placement of these sensors. Could you or anybody on this thread tell me which sensor is the OBD codes referring to P0241 & P0051? I am alos changing the spark plus to double-platinum and installing spark plug nonfouler. I did read that P0241 has something to do with fouled spark plug is that true?
I'd only use the OEM NGK Iridium plugs
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Old January 15th, 2020, 03:06 PM   #69 (permalink)
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Don't bother with double platinum, they don't last near as long as the OEM iridium, and aren't worth the trouble unless you have a reason to run them
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