firechicken76

iTrader: (14)

im doing a header swap on my 88 trans am, it has an 02 ls1/t56.

the headers are long tube 1 3/4 stainless with 3" collectors, exhaust is an slp loudmouth system.

my question is, what size y piipe should i get, the exhaust shop keeps telling me to go with 2.5" but ive heard to go with a 3". i will have a 3" cutout in a few days also.

does it make much sense to have 2, 3" pipes go into 1, 3" pipe? is the stock y pipe 2.5 or 2.75?

firechicken76

iTrader: (14)

was also wondering how much hp can be gained from....

1 3/4 lt's
no cats w/bigger y pipe
slp loud mouth exhaust or cutout open.

ive also got a ported tb, ud pulley, msd wires (whoop d dooo)

and a power robbing 9"

firechicken76

iTrader: (14)

anyone? i have to go to the muffler shop tomorrow..

conan

iTrader: (5)

I would go for 3" if you have room, If its a little tight put in a 2.75.