dont expect that much hp.
Maybe you'd get a few. PAir it wait a dual exhaust and you're in a better boat.
I don't remember how they get the results, but its kinda snekay bull****. "oh, we just added a filter and exhaust, and we got 16 hp. That means the filter did it".
Basically dont expect any gain. You may get a lil, who knows, but still, don't expect any. An intake for sure is nice tho. I have one. www.ssd4u.com