I'm planning on doing hfc's and a catback here in a few weeks and wanted to know simple exhaust bolton's will mess up the stock fuel/air ratios much to require tuning. Headers will remain stock, and intake may just get a K&N filter. My car is my daily, so long term reliability and engine health are priorities for me. Would this be relevant with the MREV mod or crawford lower plenum? Thanks.

 

past experiences with those mods say no. but just to be safe get a dyno done, so long as youre no higher than mid 13's afr you should be fine.

 

Yes. If you are finished with your air mods (intake and exhaust) you may benefit from a ECU tune. Addition horsepower and torque may not be a priority, but insuring that your car is not running lean at red line .