Intake Free mods
- 0-5rwhp Lid
- 5-10rwhp Install
Big article on lids and dyno comparisions here Filter
- 0-5rwhp MAF
Very controversial as to any real gains, may even show negative numbers due to the fact it will be tricking the computer to run lean due to the larger diameter of the housing (good for stock, since you will gain a few hp by running a little leaner than the factory slightly rich setting; however, bad for modified vehicles). Stock MAF's are good to 500+hp. Once you are beyond that I suggest you contact your tuner (or local speed shop if you are doing your own) to find out what they recomend. Some will suggest taking the maf out and doing a speed density tune, which relies solely on the front O2 sensors. Lid, MAF, Filter Install LS6 (ZO6) Intake Manifold
- 10-15rwhp Install Graph Holley Intake Manifold
- 15-20rwhp FAST 78mm Intake Manifold
- 15-20rwhp FAST 90mm Intake Manifold
- 20-25rwhp Sheet Metal Intake Manifold
Mainly for all out race engines or bigger CI engines.
Testing of Intake Manifolds Here
Also note that these hp figures can vary greatly due to cam size and head flow. Ported Stock Throttle Body
5-10rwhp Install Cold Air Induction (CAI)
- 5-10rwhp Nitrous
- Typically the size of the jetting will be the horsepower increase. Some company's rate it in flywheel and some to the rear wheels. Exhaust Listen Cat-back
- 10-15rwhp Duals
- 15-20rwhp Catted y-pipe
5-10rwhp ORY y-pipe
5-10rwhp Shorty Headers
5-10rwhp Mid-Length Headers
10-15rwhp Long Tube Headers
15-20rwhp Misc. Underdrive Pulley
10-20rwhp Electric Water Pump
Please DO NOT
take the maximum number for everything and add it together and think you will gain this by adding these mods.
Your average full bolt-on (Intake/Exhaust) Should net you around a 50-70rwhp gain, depending on how well your car responds to the mods that you do. I believe the highest bolt-on dyno is upwards of 380rwhp 390ft/lbs.
Stock dyno's range from 290rwhp-315rwhp. Automatics will dyno considerably less than a manual. Also such things as lightened flywheel will free up some hp as well. A bigger rear-end such as a 12-bolt or a 9" will show negative gains on the dyno. But you won't be breaking anything
and you will run a faster e/t due to the better launch you can have.