I think shorties will change the tone a little due to more efficient flow and therefore should increase hp too. I'm hopeing to find 10 more hp and about 15 ft/lbs torque from shorties (thats probably wishful thinking but I won't buy them for any less). I wish we had more dyno #s on mods, it would surely sell more products unless the increases were minimal (mabey thats why few have dyno sheets on their products?). I'm scared to buy anything that an unbiased person hasn't tested already. If I could afford it I would have had mine dynoed for my mods to help others with their decisions.

As for your Roush, it should have better performace than Ford's unless they just did it for the look and sound. Does it come with the regular Cats and H-pipe?

 

The size limit is listed as: (145 X 145) Max. 20KB. If it's over 145x145 it won't work.

 

Thanks don_w, I'll try again with this next roll I get developed.