Correct, but YOUR engine is pushing 2.x times the amount of power that it was designed for.

Now, I agree if you just putt-putt around and never boost in 5th gear you will most likely not have issues. Just don't sit there and think that JDM has some magical powers to keep you safe. If you want to toss money at headers, I would toss it in a built shortblock fund instead. If you want to hit 500 to the tire, bump the timing 1 degree.

 

Furthermore, I asked about information about shorty header installations not look for negative comments. For the record I don't baby my car in any way. I hit the 6k mark more times than I can count.

 

I think the money serves better elsewhere, not in doing shorties.

And good luck with your block, don't use any bad gas reving to 6k!

 

 

If you want some shorties, I got a pair sitting here in a box?


They did sound good and actually raised the hp in the 2500 to 4500 rpm range. But the passenger side leaked a bit back by the fire wall.

I cant tell if It is defective or If the guy who put it on for me did it wrong.


I took them off and replaced them with long tubes........

Now I dont know what to do with them?

 

I know I'm beating a dead horse here, but with a stock midpipe shorties are just not worth it. I'd be surprised if you even noticed a difference, most of the power people gain from doing headers is because they remove the cats too. Now if you want to do it then go ahead, I am just trying to save you some dough and most likely a days worth of working in cramped spaces lol.

 

I don't mind the work and from what others have told me the power gain is about 10hp but the TQ gain is higher than that. Also, the state I live in will NOT pass emission inspection without cats. One more thing, as I stated, I don't want the expense of getting new cats and LT's. If it was a track car, I would definitely get LT's and deal with the cost.

 

I understand why you aren't going catless, and trust me if you did lose your cats your car would be very loud. Just one more thing, just because it is illegal to remove your cats doesn't mean you can't do it and still pass inspection, ma is the same way and many people still pass

 

I have a hard time believing that shorty headers will not improve performance, particularly in slicks case with all that HP. The shorty is less restrictive than the stock manifolds so there would have to be an increase in hp/tq.
That 10hp sounds about right to me and and in your case could be more like 15. It would probably be felt in the low to midrange portion of the curve with a few more ponies up top.

I was always taught that l/t's are for the track and up top performance and shorties for low to midrange torque because a certain amount of backpressure was desired to achieve performance at those rpms. But hey, I could have been brought up by idiots! (don't think so, they all had fast cars)
While the longtubes in slicks case would yield max hp numbers, drivability would suffer...with shorties it may and should (imo) improve.
Keep us posted bro with the results.

 

My tuner said he sees gains of around 15 to the wheels with longtubes, and ~7 when people just switch to a catless midpipe, he insists that headers are not worth the money, and he has a sweet Saleen supercharged 2008 GT, and has tuned multiple 700+ hp mustangs. I trust him and honestly wouldn't do headers again, I'd rather put the cash towards a supercharger.