Hi all, sorry for the potentially noob question, but I haven't found anything about this browsing around so I thought I'd ask myself. I'm looking to do a high compression head+performance cdi+expansion chamber upgrade on my 80/66cc once it's well out of break in, and I was wondering if welding a pipe to the end of an expansion chamber exhaust would result in any performance loss. Thing is I'd like an exhaust that blows out the back so it doesn't do it on my shoes like the stock one does, but the EC ones I've seen so far all have a similar shape, they're short and they blow downwards. Do any of you guys know? Thanks!