Q: Wondering about upgrading car
I was wondering, is it safe to up the boost of my turbos on my 2007 BMW 335i twin turbo to 16psi on stock internals? Also, is it worth it to buy a boost controller to control and change the boost whenever I want too? How much horsepower gain would I be seeing if I put aftermarket downpipes on the car and turned the turbos up an extra 8 psi to 16psi from 8?
My car has 157000 miles.
My car has a manual transmission.
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