Yes I know it seems stupid that I would make all those changes without upgrading the exhaust, but I just can't be sure that aftermarket F-body headers will fit my Volvo swap. So am I basically stopping up all of the airflow I'm creating with the new parts? I plan to run a 2 1/2" Y-pipe to a high flow cat and then 2 1/2" pipe back to a turbo style muffler.

Thanks,

Matthew C. Hall

 

well I see your swap dilema but the 305 TBIs stock exaust is some of the worst ever. try to get soem TPI manifolds or LT4 vette manifolds or big chevy van manifolds.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

Chevy Van manifolds are better than the stock f-bodies??



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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

that's the word on the street.

 

you should see where you motor mounts will be before you get exaust manifolds. F-bodys dump out the rear but Vette dump in the center. You might even find some block hugger headers that dump out the center. I don't remember what the Van manifolds look like. I think GM still makes the old 327 "Ram Horn" manifolds that dump out the center like the LT4s. They have 2.5" outlets. You have lots of options but you need to narrow them down.