well its clear most sport mufflers appear to have dual outlets but were there many manufacturers?....are they desired for looks, sound or performance?...I have the chance to get one at a good price...dual in/out...some surface rust....should I be concerened about the manufact?...are some known to be too loud for street?...are they a worthy upgrade to a stock 2.2 T or only on upgraded engines?Is it silly to install on orig. 114k heat exchangers/manifolds( in good shape)?....should I just get SSI heat exchangers?....sorry for all my ?, just don't want to pass up a good purchase and I want to add some more throttle response to my T..thnx