10/5 for this beast. Beautiful welds, perfect fitment. Sounds great throughout the rpm range

Would recommend this to anyone who's looking for a race header for the rsx. It's a one piece design so there won't be any leaks like you see on many other headers for the rsx that are multiple pieces. Fitment was 99% for me as one hole on the header was off enough for the stud on my engine to not go in all the way. But I just had to shave off literally a tiny speck of the hole for it to finally go through. Other than that, it fit perfectly. It clears the stock swaybar for anyone who is wondering and I had no trouble putting it on besides that small error that was possibly just on my header specifically. Power gains were pretty noticeable as well. Forums say that you can get a few extra horses if you get other cheaper headers but I think it's worth paying the extra cash and have perfect fitment and decent power gains.

I received this Invidia header over a week ago and just had it installed by a local shop today. It's a gorgeous piece of craftsmanship and I applaud Invidia on their work. That being said I goofed and didn't consider how thick my 27mm Progress front sway bar is so there isn't really any clearance between it and the header. The shop managed to push my bar up slightly and just lightly connected my Hardrace endlinks while I wait on some Whiteline adjustable endlinks and the Whiteline 24mm front sway bar to arrive within a few days. For now I only have some mild contact in reverse and haven't pushed my car much, but I have the Injen CAI, Hondata Reflash, and Invidia Q300 exhaust. This combination breathed new life into my aging engine. It sounds great with the Q300, much deeper but not that loud, and feels so much better than the stock setup. I give this header 4.5 stars because had it been built with even a few more millimeters of drop it would have fit perfectly. Hopefully the new Whiteline setup will manage to clear everything nicely and let me really step on the gas soon!

Awesome quality and the best fitment in my opinion.

In my opinion this is the best header hands down for the money. After I installed this I picked up 25 whp mid range and 30tq mid range over a shorty header and test pipe.