Will this fit the 370?
 

Manzo Stainless Steel Catback Exhaust Axleback Fits Infiniti G37 08 11 Coupe | eBay

Basically axle back for g37 onto the 370? Looks the same as Topspeed, M2 axle back.

Axle backs are usually the same between the two, but I'd expect an eBay exhaust to not fit worth a damn on either.

Ok thanks.... I'm leaning towards the top speed cat back for $600. Some performance and not too loud at idle or low rpms.

Will this fit the 370?
 

I'd buy a used name brand exhaust from someone here before I bought topspeed, but it's better than eBay.

Yeah I would agree with you. But not trying to break the bank or am I tracking the car. I just want a bit more sound with some performance. I'm guessing I can get just that from top speed. Better than axle back and better gains. And like you said better than eBay. Though I do hear a lot of positive comments on Top Speed. More good than bad.