Originally Posted by Concillian
Full 3" will help some
It makes a MASSIVE difference compared to a stock exhaust! Spool up is way better and makes more power too.
(and I think a 10cm turbine housing is way to big for the HTA68, doesn't really give any gain compared to a 8cm housing)
So if you run the HTA68 with 8cm housing and 3" full exhaust it will be quite a bit better compared to the regular 18G in the lower RPM range. The response time when at 4000 - 5000 RPM is much better too. (due to the lighter compressor wheel)