its tested VERY well. Of course its mine so you may think my opinion is biased. but heres my .02

We had tons of people asking us about RMF Narrow headers, which were pretty much the best header you can buy. Now that RMF is out of business, there was a void to fill in the header market. We decided to have these made to fill that void.

You can PM Bucky and Paul on here, they were both present when the testing took place. Paul is actually the one that saw a 15whp gain on his GSR.

Im doing some testing Sat afternoon at DonFs shop, and i suspect others will start posting their own results very soon. I did rigorous R&D on this header, it was my first product so i wanted to make sure it was done right, and done well. You can be assured that its a quality piece and well worth its price tag in terms of looks, performance, and durability.

Im also offereing specials for pre-order people, if you place an order before Dec 1st. PM me for that deal.

Anyways, any other questions let me know