Originally Posted by
zetaboostboy522bhp
I personally use 1/1/2 pipe if your moving turbo away from the head ie over gearbox etc to keep exhaust gas speed up and 1/ 1/2 tube is good for 500 bhp .
If your running turbo on short runners ie next to the cylinder head like cosworth then I would move up to 1/ 3/4 , this would be good for 600bhp .
The main aspect is really trying to get all the runners the same length which is a lot easier than it sounds with nice radius curves and try to get as least welded joints as possible as for every weld you've got one more area where a crack can occur.
Material is the next major factor , I use 304 and never had any problems on turbo car running 500 +bhp but if you can afford it use 316 stainless
Hope this helps
Cheers Paul
Excellent thank you Paul, most helpful!
Originally Posted by
3doorcozmess
Or just buy one of these
Not sure what use that would be for a Volvo engine..