Quote:
Originally Posted by jchammond
My original Z1 cai & exhaust dyno tuned 309whp,,,since added the upgraded version cai & definitely a noticeable difference....gonna add Z1 headers & then a re-tune.  
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So in order to run the "upgraded" filters, you have to modify the aluminum bumper? Because you didn't mention it, but that's obviously modified or a totally different bumper just to fit those filters.