I can't decide.

[scupking]

How much gain should I expect with a mac H with cats and mac flowpaths welded in? Mac procamber with cats and flowpaths welded in? I’m getting one of those in the spring and I will be getting the flowpaths welded in no matter what. I’m going for that true muscle car sound but would like some gains in hp and tq.

 

[sgarlic]

None that you'll notice. If you want more power you're really going to need to go with a true X pipe like Dr. Gas or Bassani or something. Don't expect huge gains from what you're planning on.. especially if you plan to leave the cats on (high flow or not.)

 

[03ghoststang]

you will see some gain but it also depends on what tone you want if you want the old muscle car tone then stick with the H but in reality you should go for the O/R prochamber that itself acts as a muffler

 

[hognutz]

I don't think you will feal anything with on the mufflers. I went to a whole borla catback and did not feel much. probaly there but noting I really noticably felt.

I felt the x-pipe alot though. I have an O/R pipe though can't comment on the catted pipe. most of the gain you would get would be from the midpipe on this approach. I would get a different one than the mac but that is me. from what I have read DR. gas is the kind of the HP. the flowtech looks very similar as well. I went vrs becasue I wanted stainless.