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scamaro355 05-10-2020 10:16 PM
Turbo down pipe
 
Running a Bw s480. It’s 5” I’m necking down to 4” I’m curious if anyone else has ran a single 4” all the way out the back. It really curious about 4” between the heater box and engine. Non Ac

anesthes 05-12-2020 09:59 AM
Re: Turbo down pipe
 
Originally Posted by scamaro355 (Post 6371437)
Running a Bw s480. It’s 5” I’m necking down to 4” I’m curious if anyone else has ran a single 4” all the way out the back. It really curious about 4” between the heater box and engine. Non Ac
Good luck! I had a 3" in the same spot and it was very tight.

https://cimg6.ibsrv.net/gimg/www.thi...d1f1ddf4fe.jpg

Badass355ciz28 05-16-2020 10:49 AM
Re: Turbo down pipe
 
Originally Posted by scamaro355 (Post 6371437)
Running a Bw s480. It’s 5” I’m necking down to 4” I’m curious if anyone else has ran a single 4” all the way out the back. It really curious about 4” between the heater box and engine. Non Ac
When I ran a single 4" down pipe I modified the heater box and had plenty of room. It can be done.

Street Lethal 05-16-2020 02:06 PM
Re: Turbo down pipe
 
Originally Posted by Badass355ciz28
When I ran a single 4" down pipe I modified the heater box and had plenty of room. It can be done.
I did the same thing, ran the downpipe angled straight downward parallel with the box after I made the cut . It barely kissed the number eight primary, but it did clear. Could have made more room by redoing/rerouting the eighth primary on the header, but I wound up switching back to a three inch downpipe because the four inch was overkill....

- Rob


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