What are teh differences besides the size of shorties and regular headers? Do shorties give more horsepower/torque or something since they are more expensive than regular headers? What would you guys suggest for my car, Im about to get a hooker cat-back and a straight pipe cat, sorta like a gutted cat but it has a pipe running through it, so its like you have no cat. What do you guys suggest?

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87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

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First question: Do you have to go through emissions testing or inspection? If so, then shorties are your only reasonable (and technically legal) choice. Getting a y-pipe to the cat with long tubes is typically a custom (read - "expensive") job, although people have talked about a Mufflex piece that is supposed to work.

Theoretically, the long tube type will produce more power if properly chosen because the tubes are "tuned" to the exhaust pulses, helping pull more burnt gasses out of the combustion chamber. But, shorties will make a dramatic improvement in flow over stock manifolds, and are typically CARB-certified.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

Also, most long tubes won't fit cars that have transmissions other than TH350s or 700R4s.