Header choice for 3.6: 1-5/8" or 1-3/4"??
 

Need recommendations, heard the 1-5/8 was a better choice for torque on a 3.6 but with my car under 1900lbs, not sure I need that.

Suggestions? I have cams, headwork: don't want to choke down my modified 3.6.

Mark

http://forums.pelicanparts.com/uploa...1401805499.jpg

Hi Mark,

I'd need a LOT more details about your engine to offer a recommendation. :)

1993 Factory 3.6 EFI, 993 Supersprint cams, mild P&P on the heads, stock compression, muffler-less exhaust (going on my race car). Car will be tuned for 93 octane.

BTW what AF's do NA air-cooled cars like the most? A bit rich, say 13:1?

Hi Mark,

FWIW, you'll make more power with a proper dual-in/dual-out race muffler than none at all on your engine. BTDT and this is especially important unless you have good close-ratio gears.

I'd be using 1 5/8" headers for an engine in that configuration.

13.2:1 yields max power, but you cannot run that lean for the engine to survive in hot weather. You should be shooting for 12.7-12.8:1 AFR.

Ok I could go high 12's. Thanks for the tip.

Tell you the truth, I'd sacrifice some power for good sound: what configuration is good to getting a higher, smoother pitch out of the 3.6? Most sound like Flowmaster'd bastards :(

This 3.0 RSR sounded amazing at COTA: flat-collectors & center merge.http://forums.pelicanparts.com/uploa...1401831634.jpg