I have a 81.5mm lsvtec engine and i was thinking that the 1.25ar exhaust housing would be too big for that engine. It's a borg warner turbo from tim turbos 75mm with 1.25ar.
I'm also using a inlinepro manifold with 4" downpipe and 3"ic piping

 

More info on the turbo would help. as well as your goals for the setup as well...

 

my goals are around 800 to 850hp.
I bought the turbo from tim turbos.com It's a 74 or 75mm wheel , I can't remember what he said .I know it's bigger than the s372.
The exhaust housing is 1.25
It's a street car and would take it to the track sometimes

 

why in the world would you put that big of a turbo on a street car that sees the track once in a while.

Either way, With that turbo i would highly recommend using a divided style manifold with a decent runner length.

 

do you think a inlinepro manifold would work well with that set up.

 

I wouldn't assume your powerband is gonna be very good.

 

No. not at all. If you're thinking you can street this car and drag race once in a while, no divided housing is going to help you. 850whp will not work well on the street. period.

 

I'm trying to put a smaller exhaust housing like 1.01 or 1.10 . because of the engine being stock bore. The reason i have a 1.25 exhaust housing is because i had a h22 and the turbo worked good with the set up that i had. It dynoed 680 at 26lbs of boost tuned by Jason.