Alright I'm gonna come clean here.. I honestly don't really notice much difference in power. I didn't want to admit it but I'm kind of disappointed in that regard. If I hopped in an untuned bone stock 86 and then back in mine, I'd probably notice immediately, but it's just not a huge enough difference for me to try to pinpoint specifically where it feels faster or anything like that. Imo, the mid range still feels like you're making a hell of a lot of noise but not really going anywhere. Sorry to disappoint, it's probably more a fault of my own than of the mods or car. I don't think my butt dyno is sensitive enough.
I'm almost outa gas so I'm gonna give E85 a try tonight or tomorrow. I'm also wondering if new tires (still running stock and they tend to slip) or cleaning the 3 month old K&N drop in will help. I don't have the money for tires at the moment, but I'll clean the filter and try E85 and report back.
Regardless, I still don't regret it. The fat tail pipes, awesome race car sound, and eliminating that strange metallic buzzing noise above 4k rpm made it worthwhile anyway. Not to mention that now when someone says these cars are slow, at least I can say "well mine's got a lot of extra HP over stock". They don't need to know that I have a hard time noticing it
Edit: I should point out that I already had drop in filter and stage 1 tune, and if memory serves from my reading, that accounts for almost half of the 22ish hp gain I was supposed to get from the mods. So I might only be looking at 10hp gain for the header and a couple more for the exhaust.