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Old December 13th, 2008, 01:30 PM   #1
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Exhaust Question

I was reading through previous posts and i couldn't find much on custom exhausts, so i was wondering since i have the 05 V6 sedan, what mufflers would be best to go with and what size pipe would be good to use to keep or gain the most power, without sounding like a fart can? Any help or advice would be great. Thanks.
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Old December 13th, 2008, 01:36 PM   #2
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my .02 would be to get 2.25 piping with some magnaflows. remove the resonator, get a high flow cat. that should significantly give you a power gain. and with the 2.25 piping you wouldnt lose too much torque i think. anything higher than 2.5 inch piping and you would lose torque.
2.5 inch piping and up should be left for turbo applications.
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Old December 13th, 2008, 02:00 PM   #3
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i believe that 2.25 is best in which we do not loose low end torque, and i hear that 2.25 is also best because our cars need the back pressure and 2.5 inch will not do so
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Old December 13th, 2008, 02:43 PM   #4
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2.25 piping with magnaflow would be ur best bet or apexi ws2
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Old December 13th, 2008, 04:33 PM   #5
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you could always get the borla cat back system for the coupe. It bolts right up. The rear bumper just needs to get some cutouts put in. I have that on mine but when I did my cutouts I messed up and they are not even. I would have a shop do that part. Also when getting the exhaust get richies j-pipe and test pipe.
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Old December 13th, 2008, 05:44 PM   #6
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I have intake, Richie's j-pipe, and am about to install his test pipe and the borla catback. That's 2.25" straight through - anyone think I'm going to lose some low-end torque with this setup? Just curious...
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Old December 13th, 2008, 05:46 PM   #7
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you could always get the borla cat back system for the coupe. It bolts right up. The rear bumper just needs to get some cutouts put in. I have that on mine but when I did my cutouts I messed up and they are not even. I would have a shop do that part. Also when getting the exhaust get richies j-pipe and test pipe.
When you say the rear bumper needs cutouts with the Borla, I presume you don't have the HFP lip kit...right? I hope I don't have to cut my bumper to make the borla fit...(I have the HFP kit all the way around).
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Old December 13th, 2008, 07:28 PM   #8
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on the coupe, there should be cut outs already made for you if you have a V6. the 03-05 sedans have their exhaust pipes going below the bumper without cut outs.
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Old December 14th, 2008, 01:57 AM   #9
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You will not lose torque with 2.25" piping nor 2.5". People have seen gains NA in both hp and torque on the V6 with 3.0 inch piping
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Old December 14th, 2008, 11:59 AM   #10
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I have intake, Richie's j-pipe, and am about to install his test pipe and the borla catback. That's 2.25" straight through - anyone think I'm going to lose some low-end torque with this setup? Just curious...
No, you won't lose anything noticeable. I have that same setup. Just a word of caution on that Borla... its quiet. I removed the resonator and pre-muffler and now it just sounds awesome.
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Old December 14th, 2008, 01:20 PM   #11
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No, you won't lose anything noticeable. I have that same setup. Just a word of caution on that Borla... its quiet. I removed the resonator and pre-muffler and now it just sounds awesome.
Yea, I've heard vids and it is quiet. I'll have to see how "quiet" it is when I put everything on. I couldn't pass up on the Borla - got it for $415 overnighted w/ only 7k miles on it.

If it is too quiet, I'll probably go the route you did. Out of curiosity, do you notice any droning on the highway when you removed the resonator and pre-muffler? And how much did it cost you to have a shop put in a straight pipe in place of the pre-muffler and resonators? What kind of material did you have the shop use for the straight pipes? I don't want something that will rust out early. Thanks!
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Old December 14th, 2008, 04:21 PM   #12
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Yea, I've heard vids and it is quiet. I'll have to see how "quiet" it is when I put everything on. I couldn't pass up on the Borla - got it for $415 overnighted w/ only 7k miles on it.

If it is too quiet, I'll probably go the route you did. Out of curiosity, do you notice any droning on the highway when you removed the resonator and pre-muffler? And how much did it cost you to have a shop put in a straight pipe in place of the pre-muffler and resonators? What kind of material did you have the shop use for the straight pipes? I don't want something that will rust out early. Thanks!
+1 for me. I just bought a Borla exhaust with the same amount of miles for around the same price. haha! cool. I also want to know how much to put in a straight pipe.
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Old December 14th, 2008, 06:09 PM   #13
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If you are cruising around 65-70, there is no drone. But as soon as you give it gas to pass someone, there is a tiny bit of drone. It's not bad. It's just not silent, either. You can hear it.

Also, I just traded a shop my old catalytic converter for the work to replace the resonator and pre-muffler. I didn't get it made with stainless because stainless is EXPENSIVE, but it was made with some other heavy duty steel pipe. It will probably rust out in three years or so, lol. I can post pictures next time I get it in the air.
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Old January 16th, 2009, 02:27 AM   #14
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Is $450 a descent price to pay for 2 magnaflow mufflers and a custom 2.25 catback exhaust?
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Old January 16th, 2009, 09:29 AM   #15
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On the whole that doesn't sound like too much for a custom catback system but it depends on which mufflers they are selling, what type of metal they are using, and if they are going to mandrel or crush bend it, make sure you get the answer to these questions before you decide on anything.

Mandrel > crush (don't even think about crush bends).
stainless > aluminum (although aluminum is cheaper).

Remember that it will be very loud and possibly raspy with no resonator.
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Old January 31st, 2009, 12:50 PM   #16
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I asked the guy at the shop that quoted me the $450 for the cat-back with mufflers and he said that there is no place in fresno that does mandrel bends and he said it shouldnt sound too raspy with just the 2 mufflers, but if i wanted the resanator he said that it would be an extra $35. And for muffler choice he basically said that he could order any magnaflow i wanted to get, but im assuming he said the mufflers would be the standard magnaflows, not the expensive ones.
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