To buy headers or not?

Originally Posted by projectpanda

Here is a thread of some who had z1 headers and saw gains of 16whp over stock headers, and with retune added additional 3whp or a total gain of 19whp.



https://www.myg37.com/forums/engine-...ml#post3958002



Here is another result comparison of stock vs z1. Moncef from Admin Tuning saw 18whp gain with tuning, so very similar results. He said he runs Tomei headers on his personal cars and also saw gains of 19whp with retuning.



https://www.youtube.com/watch?v=zPv3pRV1kTI



Here is another one of Moncef's video where a customer of his switched to ISR longtube and ISR y pipe from stock headers and tomei y pipe and saw gains of 20whp.



https://www.youtube.com/watch?v=xGz9DjWSMgY