IM2Lazy4You

Exactly where the 17hp increase on the '08 4.6L came from? I have an '06 with the 4.6 & i'm kinda, (actually REALLY), curious as to where this bump in power came from. Different throttle body? more aggressive tune? I've searched everywhere with no answers.

IM2Lazy4You

Bump.

60DRB

the Mustang 2v engines had a head change that made a small improvement. They were refered to as "IP" (improved performance) heads by the Mustang guys. I recently read an article on a Mustang forum about 2v engine upgrades...heads/cams, throttle body, headers...

JP2085

I think you mean Performance Improved (PI) and that happened in 1999 not 2008.

As for the OP's question, I don't know. It was probably in tuning. Just a guess.

Turkey Hunter

Isn't the08 ups a 3 valve engine? I'm not positive though.

JP2085

No. The 3 valve was optional starting in 09.

Turkey Hunter

^yea I wasn't sure which year they started with the 3v.

IM2Lazy4You

Thanks for the replies so far, anymore takers? I know the 08's, (maybe some 07's?), have a different throttle body but i'm not sure if that has anything to do with it.

RocketMedic

I think a lot of it is just a different stock tune.

60DRB

I am dislexic... Maybe it took a lot longer to put the parts on trucks? Wouldn't be the first time Mustang performance items took a while to roll down the pipeline to other vehicles. Still, a good question without an answer...