Full exhaust hp gains?

[salty801]

Whats a reasonable hp/tq increase I could expect from installing shorty headers, hi flow cats, and catback, johan tuned, on a 5.7 auto challenger (2012)?

Im thinking of jba coated shorties and solo hi flow mids w/ solo catback.

Also, considering going with the 6.1/6.4 sized pipes across the board since im doing em all. From what I understand it would all bolt up same. Or would this create problems im not considering?

[fastblackrt]

Solo advertises a 27 RWHP and 31 RWTQ gain on their RT system that was dyno tested with only a few minor mods (though they don't state what they where) but those are the highest advertised numbers i've seen and I trust solo pretty well. I had their cat back on my old 2011 v-6 challenger and my butt dyno said way more power. I would bank on like a 10/15 or 15/15 hp/tq gain in my personal opinion. I think the best way would do a before dyno and after dyno on your exhaust mods. That's the only real way to know.