exhaust question
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Use a silencer, but it still can increase engine knock even though you are using a 3 inch exhaust. If you go ahead and use a silencer I would check the vitals of your engine to see if you are getting alot of engine knock under wot load.
It would depend on the timing set in the tune. Putting the exhaust back on should swing you rich if anything, but if the timing is aggressive you'll get knock. So, yes ... re-tune.



