58 replies to this topic

[bpray9223]

I am thinking about getting a custom exhaust made next spring/summer. I do know a couple shops that I'm going to look at to do the job. I have some questions though.

I want to buy all of the components, or most of them on my own(cat, muffler/res., ect.) to try saving money. I know I want to go with Magnaflow products, but my question is what size cat should I get? like how long and such. For muffler, what dimensions should I get? If I decide to get a resonator as well, what dimensions and type should I get. I am probably going to look at some ebay stores that sell magnaflow products and buy from there. If anyone knows any part numbers, can you let me know? Also, what type and what size(length) flex pipe should I get? Where would I be able to find the correct flange for the DP? Also, will I need to get a cat. with the O2 sensors openings built in, or will the exhaust shop weld bungs on the pipe? Will I need any O2 elimiantors, or spacers to avoid CEL's?

Again I want this exhaust to be good for daily driving, but still have a nice note when accelerating. I don't really mind SOME drone, considering I don't drive for long distances. Also, I want to avoid getting bothered by cops. But then again, I baby my car, and I'm not one to go around from stop light to stop light WOT.

Any suggestions will be helpful, thanks.

[ozzimark]

I haven't gotten around to doing it yet, but I plan on getting this cat, with a bung welded in right after:
http://www.summitrac...arts/MPE-59959/

And two of these, one where the suitcase is now, one right before the tip:
http://www.summitrac...?part=MPE-12579

Assuming I can fit them in

[L8 APEKS]

You didn't have 3" DP and 3" cat-back as an option. That would be my vote!

[Boost3237]

L8 APEKS, on 09 November 2009 - 04:23 PM, said:

You didn't have 3" DP and 3" cat-back as an option. That would be my vote!

he does not want to draw attn to himself though otherwise I would said 3" turboback

[rbodor3]

Boost3237, on 09 November 2009 - 05:15 PM, said:

he does not want to draw attn to himself though otherwise I would said 3" turboback

+1

You need 3" turboback

get the longest magnaflow muffler you can find if you do 1 muffler setup. I am running two 20x6inch (IIRC) mufflers and it's louder than stock, and noticeably louder when pushed.

[L8 APEKS]

Am I the only one who thinks that the difference in volume between 2.5 and 3" is marginal?

Full 3 inch:

2.5 inch cat-back:

18T, 3" DP, 2.5" exhaust: http://www.youtube.com/watch?v=EYs368qwDb4

[ryan850-t5]

3'' turbo back.

Get the cat that oni posted. 2 mufflers will make the system just a little louder than stock but still have a nice tone.

Also think about upgrading your exhaust housing on the turbo to an angled flange. It has a bigger opening for more air flow.

[bpray9223]

rbodor3, on 09 November 2009 - 05:19 PM, said:

+1

You need 3" turboback

get the longest magnaflow muffler you can find if you do 1 muffler setup. I am running two 20x6inch (IIRC) mufflers and it's louder than stock, and noticeably louder when pushed.

Hey do you think you could tell me your exact exhaust setup and the components? any sound clips?

[Boost3237]

L8 APEKS, on 09 November 2009 - 06:07 PM, said:

Am I the only one who thinks that the difference in volume between 2.5 and 3" is marginal?

Full 3 inch:

2.5 inch cat-back:

18T, 3" DP, 2.5" exhaust: http://www.youtube.com/watch?v=EYs368qwDb4

As far as the sound difference no. But its enough to matter to some.

[bpray9223]

Yea I'm thinking now that I might do full 3" with one cat and either two short magnaflow mufflers after the cat, or one long magnaflow muffler. Also, where can I get a flange for the turbo(my current one) I don't have the money to be getting an angled flange. And, what will I need to do with my O2 sensors?

[L8 APEKS]

Have O2 bungs welded in to the new pipes. Shouldn't cost more than $15 each.

[ryan850-t5]

my bad i didn't see that you have an s60.

go with the 3'' turboback and youll be money. nothing else needed besides cat, and 2 mufflers.

[ozzimark]

brian pray, on 09 November 2009 - 10:15 PM, said:

Yea I'm thinking now that I might do full 3" with one cat and either two short magnaflow mufflers after the cat, or one long magnaflow muffler. Also, where can I get a flange for the turbo(my current one) I don't have the money to be getting an angled flange. And, what will I need to do with my O2 sensors?

Two short mufflers will probably drone a lot on the highway. Stick with the biggest mufflers you can fit for the straight through type. It's not like they really affect performance

[bpray9223]

So should I get a medium sized muffler? And then should I get a small resonator as well?

[bpray9223]

anyone have any good recommendations for resonators?

[ozzimark]

I would forgo the resonator, and stick with two mufflers.

[bpray9223]

So I think I have decided that if I do this I want to go full 3". Should I do two short mufflers, or one medium size muffler and a straight through resonator? any recommendations on resonators? Also where can I source a flange for the turbo to DP? any what should I do about the O2 sensors?

[rbodor3]

yeah ditch the resonator, go with two short straight-thru mufflers. Why do you need to source the flange? Just cut it off of your existing down pipe and weld it back on. If you want to buy one I'm selling for $20 for angle-flange housing, I'll grind and clean for an extra $10.

O2 sensors - keep them in the same spot just put a thread-o-let welded where they go. I would also advise you add an extra for a wide band should you want to add in the future.

[ozzimark]

brian pray, on 12 November 2009 - 01:21 AM, said:

So I think I have decided that if I do this I want to go full 3". Should I do two short mufflers, or one medium size muffler and a straight through resonator? any recommendations on resonators? Also where can I source a flange for the turbo to DP? any what should I do about the O2 sensors?

Why do you keep going back to two short mufflers? If you don't want much drone on the highway, you've got to stick with the largest straight through mufflers you can fit.

[bpray9223]

rbodor3, on 12 November 2009 - 05:20 AM, said:

yeah ditch the resonator, go with two short straight-thru mufflers. Why do you need to source the flange? Just cut it off of your existing down pipe and weld it back on. If you want to buy one I'm selling for $20 for angle-flange housing, I'll grind and clean for an extra $10.

O2 sensors - keep them in the same spot just put a thread-o-let welded where they go. I would also advise you add an extra for a wide band should you want to add in the future.

Well I want to keep my stock exhaust system intact.
And the guy above says not to do two short mufflers? so should I do a medium sized muffler and a striaght through resonator?