[Drifter]

Hi Guys, looking at having a custom exhaust built, Downpipe, de-cat and catback. My thinking is 76mm for Decat and Downpipe and 63mm for the catback. Reason for going 63mm for the catback, is because we run at very high altitude.

Any comments?

 

[Colin1337]

Turbo = back pressure
The less restriction, the more efficient your turbo



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[Sekred]

Sounds fine to me.Turbo Exhaust Theory

 

[Sekred]

And further more, the dump/down pipe should ideally use a splitter/separator when the turbocharger uses a integral wastegate IMO. See images.

BW turbo