Originally Posted by Polar Bear
What's causing that crackling and popping? Is that the sound I should be looking for? I have factory for most of the piping. At the end is Borla mufflers and tips.
The cracking/popping is the result of small afterfires. The unburnt fuel from injectors pouring it into the motor at WOT doesn't get filtered because there are no cats to do so. It enters the hot piping and combusts. It's totally normal for performance exhaust.
Borla sounds wicked with a quality X. I honestly don't like the X unless its on a 4v, even with Borla. If you ask me, 2vs just don't sound right with bullet mufflers and an X, they aren't deep enough. The only exception in my book is to include LTs to deepen everything up.
Chambered mufflers produce that deep roar us 2v-ers need a bit of help making.