I baught my truck used. it's a 99 dak with a 318. The guy before me put on a throttle body spacer, k&n drop in filter, flowtech headers, and a magnaflow exhaust. Does anybody know how much HP was gained from doing this?

 

I would take out the TB spacer and you probly get more power

but I would get a CAI and you'll see a bit more power.

 

Hmm, i would say maybe 15-18hp. maybe 20 without the TB spacer lol.

 

I have a Throttle Body Spacer, but I am not convinced that it makes you lose horsepower. I know everybody seems to hate them on here. The TBS will spin the air into the manifold, but probably won't continue down the into the intake valve. TBS spacer are meant for carb engines because it has runners that go directly to intake valve. There needs to be some hard evidence to prove that TBS don't give horsepower. I haven't seen a dyno sheet to prove it does or doesn't so... I didn't pay for mine so I won't be upset if it doesn't gain horsepower. But,I suppose the mods you have done gained you around 15-25 HP or so. You need to get a Cold Air Intake. That's just my 2 cents

 

Sweet. Thanks for the input everybody.

 

15-18hp? Maybe on a 5.2. I'd like to see before and after dynos.

If you add up aftermarket manufacturers claims, then maybe so.