3inch vs 3.5inch

[JP]

I have the exhaust made in 3" 304 grade 1.6mm wall stainless tube from the cast turbo elbow back. It then goes to a 3" metalcat, then to the lukey race rear muffler. I couldn't be bothered cutting a turbo flange to make a split-dump pipe.

The engine etc is in my GX70 wagon: http://www.toymods.net/forums/showthread.php?t=6078

[ReQuieM]

FK 1.6mm wall that must weigh a bit!!

[Ray_GZ20]

can any one else offer any advise i might just go 3" whole way with metal cat and seperate pipe for wastegate ill be needing one soon

[Draven]

just realised you're running the stock turbo.
3" all the way will be plenty

[1JZ.747]

if your planning to go to a single turbo later on 35/40 or larger, i would suggest 3.5 inch.