I HAVE AN '89 GTA AND I WANT TO PUT HEADERS ON IT I THINK I'M DOWN TO EAITHER HOOKER OR SLP WHAT DO YOU GUYS THINK IS THE BEST AND WILL GIVE THE MOST HORSEPOWER (STREET LEGAL)? I WAS ALSO THINKING TO PUT DUAL EXHAUST ON IT, IS THAT A GOOD IDEA? HAS ANYBODY DONE IT? IS IT WORTH IT?

 

For a 305 or stock 350 SLP 1 5/8 headers,dual Random Tech Cats,and SLP 3 inch catback is hard to beat.Go with 1 3/4 headers if you plan on doing internal mods.

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1990 Trans Am GTA
Bosch plat+4 plugs,SLP plug wires,Hypertech coil kit,Fastchip PROM,SLP 160 therm,T-body bypass,SLP crankpulley,Breathless AFPR,,ported plenum,SLP runners,SLP flowbooster,SLP cold air,K&N,SLP 3"catback,SLP torqueconverter,SLP shiftkit,Mobil 1
14.3@96 stock
13.5@102 w/mods

 

I HAVE A 350 IN IT. I HAVE ON THERE NOW A STOCK CONVERTER WITH 3" PIPE BACK TO A FLOWMATER. I ALSO HAVE AN INTAKE AND MSD.

[This message has been edited by JEFF'S GTA (edited November 21, 2000).]

 

I have a similar Q: I was planning on either Hooker Shorties 1 5/8 or TES, and replace my stock dual cats with hi-flo cats and get a 3" int. pipe, any suggestions?

As for true duals, I saw some flexible exhaust tubing, premium grade Stainless, 25' 3" ID for less than $200, 2.5" for $130, it might work and you could pry do it yourself, and save some $$ on labor. Just a thought, I haven't figured out where to put the mufflers yet though.

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90 IROC 5.7l (L98)
ram air, K&N's, air foil,Flows

LIKE A ROC

 

GO TO THE AFTERMARKET PRODUCT REVIEW BOARD AND GO DOWN TO "SLP HEADERS" IT WILL TELL YOU EVERYTING YOU NEED TO ABOUT HEADERS. I HAVEN'T FOUND MUCH ON HOOKER HEADERS I GUESS THEY DON'T COME WITH THE Y-PIPE AND NOBODY WANTS THEM.

 

Since you're in California, the smog checkers might hit you if you have dual cats for a true dual exhaust.

I believe Flowmaster has a dual-in, single-out muffler made specifically to plug your headers in and have a single large diameter outlet for the catalytic converter. Because the headers are dumping into a common chamber, it automatically balances out both sides of your V8.

Heavy commercial trucks with V8s had been using the dual-in single-out muffler design for years, so it must work well.