change x pipe or exhaust?
I am confused on your current mods and what you are wanting to do??
Always a good idea to keep an X pipe on the exhaust and eliminate whatever restrictions you can.
Performance and sound

Or Get LT headers, no cats and X pipe. Hands down the best mod u can do for this car. 100rwhp with tune.
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when you say no cats, would the headers replace the first set and the x pipe replace the secondaries? i'm not sure what the stock c63 setup looks like, if someone can post an under car pic of the stock exhaust i'd be interested.
100 rwhp with headers and tune essentially hey? how much power can you make with x pipe/ reso delete and a tune?
how much are headers on average????
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