hi i am looking forward to buy a j's racing header and i would like to ask if it fits with an invidia test pipe and invida q300 i already have i also worry that because of the weigh of invidia exhaust vibration is gona affect j's racing welds like cracking them i drive like a maniac please tell me what you guys think thanks!

 

They'll fit just fine with your tp and exhaust. I doubt you'll crack a j's header. Honestly I haven't heard its anyone cracking a header, not even ebay ones.