Exhaust Options

Typrus · Mar 21, 2008

So now that the Stage 3 goodness is mostly in...
Exhaust options!

2.5" or 3"? With 23, 24PSI boost pressures... Whats the better option?

Looking at-
Magnaflow 93006D (2.5") or Magnaflow 93009D (3") Cat
Aero-Exhaust Turbine-Resonator 2525 or 3030. OR
Turbo-muffler 2.5" or 3", probably Magnaflow (whatever the exhaust shop has)

What is the best option you guys think?

SccotBomb · Mar 21, 2008

go with a 2.5" turbo back.

J double R · Mar 21, 2008

^^^^^ bingo.

btcost · Mar 21, 2008

2.5 turbo back

go with just the cat at first. if you do not like the sound (i.e too loud) then add a muffler/silncer.

save your money up front. you will be surprised how quiet the car is with just a cat. even @ 2.5 inches

SccotBomb · Mar 21, 2008

I suggest go with out a cat, ( waste of money ).

roadlust · Mar 21, 2008

cat......muffler.......whatever, you are going to have to spend money on keeping the noise at a level you can live with. I think these engines are too loud with only the cat or a single muffler so I say get the cat and add a muffler if you want less noise. In years past I would have prefered the sound of only one of the decible dampners.

nickhallnavy · Mar 21, 2008

roadlust said:
I think these engines are too loud with only the cat or a single muffler

what? mine is only slightly louder than stock.

i have a 2.5" cat back with no muffler

roadlust · Mar 21, 2008

I just listened to your youtube clip....as I said in earlier years I would have perfered that sound, it sounds good.....but I never would have said it is "slightly" louder than stock. It is considerably louder than stock. A decible meter would show a big noise level difference.

Typrus · Mar 21, 2008

I have to pass emissions. Cat=must. No, I will not hollow it out. I care about the brown cloud over Ft. Collins.
I'm getting the KERMA WGIF DP. Can't remember if its 2.25 or 2.5".

So 3" is useless?

Satiro · Mar 22, 2008

I deleted both mufflers and keep cat... sound is louder and higher that stock... I'm thinking about to install a PP 2.5" downpipe, and 2.5" straight pipe for the rest... I don't want a terrible sound...if i add one Magnaflow high-flow cat and one resonator, will be the sound more acceptable?

nickhallnavy · Mar 22, 2008

roadlust said:
I just listened to your youtube clip....as I said in earlier years I would have perfered that sound, it sounds good.....but I never would have said it is "slightly" louder than stock. It is considerably louder than stock. A decible meter would show a big noise level difference.

hmm the only time i can hear a difference in loudness is over 3k rpm's, which isn't often

richkcmo · Nov 5, 2009

i must say I have the same magnaflow too and love it, you can usually get a used one on ebay or cragislist. I wanted a valid warranty so I got it here. Magnaflow 93006D. Also some of the forum sponsors selling magnaflow*usually have a sale going on. Either way its a great cat, sounds great, and very easy to install.

milehighassassin · Nov 6, 2009

I always say go with the biggest available on a forced induction car. So go 3", that is what I am doing.

Exhaust Options

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