hey, i know i hav eposted alot of posts lately, this will kinda sum them up,
i am confised as to what i am goign to do here.

currently i have compleat stock exhaust on my LB9 except for i cut the old stock muffler off and got a dynomax superturbo with 2.5 inlet and cross dual outlet.

i had in mind to get this y pipe from slp
http://www.slponline.com/view_produc...RTNUMBER=31031

and connect that to the manifolds and stock cat. should i leave the 2.5 dynomax muffler, the other factory pipes look ok. i was thinking of the edelbrock cat back to go alond with that (i have hit now 500 bucks an di am on a tight buget.) should i do the edelbrock catbact (better sound than superturbo) or the ypipe? it is a daily driven car i never bring to the track but like to have a little stoplight to stoplight fun.
thanks
-Stell


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1988 IROC-Z 305TPI MINT!!
Mods= Accell SuperCoil, MSD 6A, Ported Plenum, No MAF Screans, K & N, SLP AirFoil,180 Thermostat+ Temp Switch, Relocated MAT, Cold Air. ,MSD Ignition wires and a few other misc goodies

1988 Pontiac Trans Am. 305 TPI Beyond MINT Condition. Dynomax Catback

 

if you want a power increase then forget the catback. Get headers & Y-pipe.

 

I wouldn't get a set of headers until you have a cat-back system. If you have headers in front of a stock cat-back your headers will out flow the rest of your exhaust and creat massive turbulance and it won't do much for your car. My friend put headers on his 88 IROC with a stock exhaust set up behind it, and all his 1/4 ETs were decresed by were .1 seconds. When he put his Flowmaster cat-back on, his ETs dropped by a whopping .45 seconds! Its just my opinion that you should do a cat-back first, but if you want headers, then be my guest.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!