I am building my project 89 Formula right now and I need to know what you guys think I should do about exhaust.

The motor is a Ram Jet 350 with Fast burn heads and a LT4 Hot Cam. I already have some 1 3/4 SLPs on the way, but what size catback do I need. I figured 3in would be too small. Should I do a 3.5in Mufflex or would 4in be too much?

What do you guys think? Let me know.

Thanks



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L98, 3.27 9-bolt, Hooker shorty headers, custom 2.5inch Y-pipe, no cat, 3inch 2chamber flowmaster, JET AFPR, Ported MAF, Best ET: 13.86 @100mph. 1.99 60'
17 inch ROH "ZS" wheels. 17x8.5(front) and 17x9.5 (rear). Firestone Firehawk SZ50s. 245/45/zr17s and 275/40/zr17s. T56

On the way... Radar Blue 89 Formula, T56, Ram Jet 430, Ram Air, 17inch ROHs.

 

I would go with 3" or 3.5" 4 would probally be too much. My buddys bird has 3.5 straight and its LOUD, sounds pretty good. I recorded my 3" cat back and they poseted it in the movie page. Its a quicktime video, might give you some idea.

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http://sites.netscape.net/bulldogfrazier/homepage
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http://www.fracoinc.com/


Keep your ride shinning with pride

 

"I would go with 3" or 3.5" 4 would probally be too much"

I agree. I wouldn't recommend a 4in. exhaust unless u had like a 383 and were modding it.

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Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

 

If I am not mistaken the y-pipe on the slp headers in 3 inch so I am not sure that 3.5 exhasut would help much. I could swear I have read that sigle 3 inch was good to 450hp. you won't see that so you should be fine with the 3 inch.

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"I don't trust anything that bleads for five day's and doesn't die"
88 iroc slp headers,borla catback,procharger to come soon.