OK, I have a 91 Formula with a 406 solid roller motor with a miniram. The exhaust is SLP 1 3/4" headers to the dinky Y-pipe into a 3" Random Tech cat into a mufflex 4" system. I shift the car around 6700.

My best 1/4 mile time so far is 12.49 @ 109. The car weighs 3725 with me in it. Do you think the headers, mainly the little 2.5" Y-pipe, are hurting my times? Do you think Hooker Super Comps would help? If so, how much improvement do you think I would see? 1 tenth? 2 tenths?

 

If you are talking about the Hooker 2055, which they call Super Comp, the answer is "no, they won't help". The primaries are 1-5/8" OD, the pipe from each collector is 2-1/2" OD, and the y-pipe to the cat is 3" OD. Just the primaries alone will hurt you with the Hooker shorties.

Super Comp full-length might be a different story. Then you'd have y-pipe to cat, ground clearance issues. SLP's with dual-cat would probably be a step up, though.

I certainly wouldn't complain with about your ET, though, especially at that weight. But, my frame of reference is from a track at 5800' elevation...

------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. 0.030 over 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlock header mufflers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, LT MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1/95.5 @ 5800' Bandimere.

 

I was talking about the long tube super comps. Would I be better off keeping the SLP headers and adding a 2-cat setup or should I install the super comps wihtout a cat?

Also, for the Super Comps, where is hte best place to install the bung for the 02 sensor?

 

ttt