It’s not going to get much louder than it already is with a muffler/resonator delete. Note: loud doesn’t necessarily = good sounding. An small displacement N/A boxer engine isn’t really going to be cost effective to modify anyway. The crackling/popping on the overrun can be achieved with ECU tuning, mainly as a side effect of aggressive fuel injector timing. But at the same time, it would be kind of embarrassing to do all that only to have your doors blown off by a family in their newer Toyota minivan.
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