08 Bullitt 2310

I have an otherwise stock 85 stock GT 5 speed but am wanting to get some shorties that accept an 86 up mid pipe and back etc.I have a chance to get a good deal on some MAC equal length 1 5/8 direct replacement model #9028690.It says they are recommended for high hp cars which mine is not.I dont want to kill a bunch of low end with these and a catless 2 1/2 h pipe.
What do you folks think?

FORD TOUGH

Here is a dyno chart of a header shoot out, I do not know how accurate it is, JBA has a different chart on their website.

08 Bullitt 2310

Thanks!That is good info!Looks like they will do better than stock and are cheap so..........
YEAH!

zeekstr

Anything is better than stock. But prepare to have the time of your life.
Getting old exhaust manifolds sucks!!!

Portmaster

I personally think it would perform better with a smaller 1.5 inch equal length header but I don't think it would be enough differance to pass up on a good deal on the 1-5/8 headers. I have to wonder what MAC considers high horsepower. IMO Shorty headers have no place on a high hp engine unless they are flipped over feeding into a turbo(s)