Well dynos that have been done on FS motors show about 4-6 hp increase. We have not done dynos on our product itself, but I know it matches or exceeds what the dynoe'd products are because of the design and so forth. The biggest gain is really that it is helping cool the overall assemblies and the air temp. We measured temperatures of more then 20 degrees cooler in some cases, more in others, and less in others as well. All in all it's really just one of those extra parts you can do to get some gains and have some improvement and even a little more cushion against detonation overall. It's a cheap modification compared to a lot of things out there... and in fact we have them on special right now for even less than the normal cost!
let me know if that was a good enough answer!
Thanks,
Steve
NSN Motorsports