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Old 01-28-2008, 12:19 AM   #1
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Default Magnaflow catback exhaust, good for Turbo?

Hello, i'm soon to be upgrading to a Bell Series 1 Turbo kit with Garrett GT2554R, this car will never see more than 220 horsepower (I want reliability and drivability, not open hoods), should I go ahead and sell my Magnaflow 2.25 inch catback exhaust with hi-flow cat, or should I keep it and just delete the catalytic converter. (In Alabama, our cops don't care about that stuff)

I would think that running just resonator and muffler would surely open up the exhaust...
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Old 01-28-2008, 12:23 AM   #2
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no cat FTW

you should be OK with that exhaust, but a 2.25 is pretty restrictive, going with a bigger pipe, like 3" will help your spool a lot and wont restrict as much up top...its your call though, its cheaper to keep what you have
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Old 01-28-2008, 01:06 AM   #3
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A 2.5" should see a noticeable gains even...but you could try it w/ no cat...then just take the whole exhaust off and see what less would be
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Old 01-28-2008, 02:02 AM   #4
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You'd want at least 2.5inches.
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Old 01-28-2008, 10:09 AM   #5
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It's certainly better than stock. I'd tackle other things first.
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Old 01-28-2008, 10:58 PM   #6
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Such as???
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Old 01-28-2008, 11:04 PM   #7
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Like an intercooler upgrade for the kit.
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Old 01-28-2008, 11:16 PM   #8
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Is not the stock intercooler big enough? I don't want anything that's too massive that it lags the throttle or makes me remove A/C
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Old 01-28-2008, 11:38 PM   #9
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Quote:
Originally Posted by Cody Strife View Post
Is not the stock intercooler big enough? I don't want anything that's too massive that it lags the throttle or makes me remove A/C
Oops, sorry. Didnt see you going for the Begi S1 kit, it has an intercooler.

You could spend the money on a wideband, or a high pressure fuel pump since you will probably be using the AFPR.
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Old 01-29-2008, 10:44 AM   #10
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Quote:
Originally Posted by Cody Strife View Post
Such as???

you said it yourself, with your turbo you aren't looking to make the most amount of HP available. Upgrading the exhaust while it may net small HP/TQ gains, wouldn't really be the first of your concern. It's certainly better than a stock exhaust and should be sufficient for now. I doubt you'd notice a big difference one over the other with that turbo, it certainly couldn't spool much faster
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Old 01-29-2008, 10:49 AM   #11
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well i do agree with brainy on the priority list...
maybe you should look into a better clutch, maybe brake upgrade and diff upgrade unless you already have a 7" rear...
what year is your car?
look into watermeth as well, its a very nice insurance policy
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Old 01-29-2008, 11:16 AM   #12
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for that power level I'd keep the 2.25" exhaust for now. you'll need a clutch, timing control (don't think the S1 includes Bipes), and injectors. Once you up those things you should be able to hit that power level without any problem on the exhaust you have now. Once you reach your power level change the exhaust to help spool and increase sound.
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Old 01-29-2008, 12:00 PM   #13
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Quote:
Originally Posted by whaaamx5 View Post
look into watermeth as well, its a very nice insurance policy
Meth for 200whp!? Magana is that u?
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Old 01-29-2008, 07:40 PM   #14
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New high performance clutch, already got that Did I forget to mention I was running a JRSC Supercharger
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Old 01-29-2008, 07:45 PM   #15
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Meth for 200whp!? Magana is that u?
lol, no its not magna
i do think that water meth is great though, easy to make more power by increasing timing while staying on the safe side...

i still have no idea what the newb drives though
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Old 01-30-2008, 12:10 AM   #16
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Originally Posted by Cody Strife View Post
New high performance clutch, already got that Did I forget to mention I was running a JRSC Supercharger
*Sigh* another misguided soul. at least you are going turbo now.
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Old 01-30-2008, 01:22 AM   #17
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I'd do a 3" exhaust. It's going to improve spool and response and get you power.

Begi S1 + MSPNP + injectors + wideband + clutch/exhaust/etc = a reliable, bulletproof 220whp
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Old 01-30-2008, 12:29 PM   #18
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Pm me if you decide to sell your SC kit
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Old 01-30-2008, 12:35 PM   #19
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Quote:
Originally Posted by Savington View Post
I'd do a 3" exhaust. It's going to improve spool and response and get you power.
Do it once.. do it right.. do it 3". One day you'll catch the power bug and want more boost/bigger turbo and you'll be glad you did it. Werd to your moms.
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Old 01-30-2008, 12:39 PM   #20
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what good is a 3" on his 2554R if all he gets is 10hp up north, 100rpm extra spool and major booost creepage. If he had a 2560 or 2860 I'd say hands down do it.

I know I'm all about 3", but I think money could be spent elsewhere.
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