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Quick custom exhaust question (vband)

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turbo98eclipse

15+ Year Contributor
1,096
15
Jul 27, 2004
northern, New Jersey
If I plan on going custom exhaust off of a hx40 with a vband flange:

--What angle do I need to leave the turbine housing enroute to the rest of the exhaust? Im not sure if 90* is too sharp --

--If the flange for the vband is 4", is it safe to reduce down to 3" assuming it will be meeting up to 3" exhaust piping? If so, where would be the best place to make the reduction?

--Will there be any issues with boost creep with no o2 housing and a large 4" diameter piping? (I think I caught a glimpse of the words "boost creep" while googling for these answers if this seems like a weird question ;) )

Thanks!
 
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