I agree, the low #'s are most likely due to the lack of headers. However, I have noticed a couple of members dyno over 300rwhp with stock manifolds and stock cam, so there could be something else wrong. How are your plugs/wires/opti/fuel filter?

 

No it does not have stock or hypertech tuning. The car was dyno tuned. Everything was supposedly tuned to the right specifications of my cam and other mods. Also, when I was installing the cam I checked the opti, it looked fine, and I replaced the fuel filter when I installed my Walbro pump. Plugs and wires...thats a different story. I don't really know about them..or if they have ever been changed. I am the second owner of this car, so I don't know if they have ever been replaced.

 

Then invest in a set of good wires and some NGK TR55s.

 

Also check that line that goes to the TB from the passenger side valve cover.. Cap the TB off and stick a breather on the valve cover where that tube was coming out.. I have seen some loose about 6-15 horse because of oil getting in the intake and lowering the octane rating and getting on the plugs etc.. might just want to get rid of that..

 

What breather are you using? I broke that hose the other day and was about to buy another one, but now that you said that, i'll just buy a breather.

 

I am making 330 to the rears with mods in my sig... basically a full bolt on hotcam M6..........

 

I bought a spectre breather from pepboys, its a iniversal size.. Im not sure waht it was though.. Umm, just take the valve cover peice in to pepboys and match it up, i chose the bell type because i think it looks better and will control oil better than a regular K&N type breather and i can clean my engine bay without haveing to worry about water or anything getting into it.. I think it was liek 3 bucks

 

Did you really notice a difference? Would that set off a code or somthing? Thanks

 

does the mustang dyno make any difference?