Thinking about the Xtreme flow muffler instead of Corsa. The need for backpressure makes sense.
How hard are these to install since they are only a muffler? Can they be done myself or does a shop need to cut and weld?
Also, are the xtreme flow headers dropin?? Can they be done myself?? or does a shop need to install??
Air intake looks like filter only??
Finally...Predator programmer or powerflash??
Mods worth it?
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