Stang9946

So the 96-98 are rated at 225hp flywheel. The 99-04 are rated at 260hp flywheel because they have better heads and intake manifold. That's a difference of 35hp. If you do a headswap on a 96-98 wouldn't you need a tune with that as well? So if you did the head and manifold swap with a tune what would that put you at flywheel hp wise? Wouldn't that put you ABOVE the 99-04 260hp rating? I've heard a few people say it will give you a 45-65hp increase. (270-290hp flywheel) A few people have been arguing about this. I remember seeing something about it on the forum but I can't find it. Thanks in advance.

white 98 gt

96 & 97 had 215 h.p. 98 had 225. have heard of people taking the npi heads & rebuilding to outperform the pi ones. any comments guys?

Rantheman

Well from what I know that when your compression goes up from 9.3 to almost 10.5 that worth a good 5-10hp other than that could tell you what i was bored .030 over too so i am running between 10-15 more hp but i will see in the near future

Stang9946

I've argued this before and said the same thing and was told that, that information is false...that 96-98 had the same hp.

jmmorgan82

instead of rebuilding the npi heads, you can find a set of used pi heads and do the same work as you'd do to the npi heads, and make alot more power. and you can usually find the heads for pretty cheap assembled. throw a nice cam in there and you'll be flying.

Rantheman

Plus if you had a tune and a p.i. swap you would be over the 99-04 gt because the tune and the swap you put you close to 300hp at the flywheel

Stang9946

So just a head and manifold swap with a tune will put you close to 300hp flywheel? [:-]

jmmorgan82

I think if you did a good port/polish job on some pi heads, put a nice cam in, and did all the rest of the bolt-ons, you'd be around 300.

David_K

i made 308 in my white saleen. with ported heads, race cams/valvetrain, full bolt on (-intake manifold)

Rantheman

well i am getting a tune soon but when you think about if you had heads intake no port no polish then if you added lt headers full exhaust with tune you would be at 300hp or above at the flywheel i have like every bolt -on on my car plus cams heads intake and bored .030 over with 10.2 compression so i am pretty sure i am passed the 300 mark at the wheels