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I've never heard the TORs are more restrictive than, say D&D, but I suppose that makes sense given that they aren't as loud either



I'm not saying it's fact. I'm just going by what i've read. I've heard many say they noticed no difference in performance and never once heard anyone rave about thier performance. On the other hand pretty much everyone who installs thunderbike pipes for example almost to a man rave about the performance gains. A couple here have even had both and say no comparison.So thats where i get my impression of tors, but again it's not thru personal experience. If i thought tors would give me the same boost i'd probably sell my Tpipes tomorrow just for the quieter sound, assuming i could find the TOR's that ARE quiet. (as you know some are some aren't)