Hello all, I have the Twice Pipes and a MSA 6 into 1 on my 73 240Z. It has a L28 of unknown specs in it (im pretty sure its stock though) but it sounds awesome a bit like the old E/D type Jags did. What ever you do though, if they offer anything other than standard steel or coatings on it, get them asd both my header and exhaust look terrible and they are only a few years old.