handyandy

I have a 2.5" mac catback, with stock headers and stock midpipe. If I was to replace my stock midpipe with a Prochamber, would it fit my stock headers and 2.5" catback?? Do midpipes come in sizes? Because all of the websites I've looked at don't have diameters. What size are the headers?

Mark99GT

Every midpipe I know of is 2.5" Yes a prochamber will fit.

handyandy

Thanks, anyone else? Will it for sure fit my headers up top too? About how much rwhp could I get off a catted prochamber?

meebix

Yes, it will 100% positively fit. Midpipes come in different sizes based on if you have stock/shorties headers, or if you have longtube headers. That is length though, all aftermarket pipes for our cars are 2.5' width, so in other words you are all set.

Just make sure you get a "regular" length prochamber (as opposed to a shorty prochamber which would be for longtubes) are you're all set.

As far as the gains, most midpipes make about 5-6 rwhp.

sitnlopro99gt

+1 to all said above