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Is it bad if I turn up the boost with no downpipe and exhaust mods? I want the sleeper look, but will my turbos suffer since I have more backpressure? As of right now I'm just running at 18psi w/ a manual boost controller. Are there any downsides to this? Thanks.
 

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I would at least run a downpipe. This will let more heat out of the engine. Other than that you probably won't have a problem unless your #2 turbo goes, which is always possible at that boost level.

Later, Steve
 
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