Air Intake, Exhaust

[guruerror]

I went with a the K&N "Fuel Injection Performance Kit" (57 series) and a Flowmaster American Thunder exhaust (with ceramic Gibson shorty headers).

I did the K&N first...I noticed a bit more response from the throttle and a bit more growl from the motor...nice.

The exhaust work was done about a year later...much better sound, maybe a little better throttle response and pick-up, but I could also just be 'thinking' it's better cause the truck 'sounded' so much better.

Just like Xotik H3, I got about another .5-.7 MPG after doing both. I've averaged 11.8 over my last 10,000 miles.

These CAI and exhaust are the first two mods I do to every vehicle. They're the mods that keep on giving...power AND MPG! Let that motor BREATHE a little easier.

[IRA51]

I sugest you get your H2 dynoed B4 the intake and exaust ,then dynoed after and when you see a 2 HP differance after spending $600.00 or more you won't be a happy camper . But you will get lots of kool sound . On a stock engine you will see almost no power gain with a cat back and intake .

[mbdougl]

I found this on another site, it cracked me up.

Simple engineering calculations!
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.

Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].

Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].

3 HP maximum improvement +- any temperature change improvement.

Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.

Reminds me of the old days when we used to flip the air cleaner lid over on the carb, made it sound like you had all kinds of power but actually was pulling in hotter air!

[Scarsman]

Originally Posted by mbdougl

Reminds me of the old days when we used to flip the air cleaner lid over on the carb, made it sound like you had all kinds of power but actually was pulling in hotter air!

Ah yes! The good old days! Sure did sound cool!

[H2Much]

Thanks for the input guys. I think I might try the intake and see about doing headers and exhaust. I keep getting the supercharger advice, but I can't affor to buy one of those and then replace everything after 10,000 miles of it burning everything up on my ride. I am hoping that with my regear and the superchip that the intake and exhaust will compliment the performance of the chip a little bit more.

I am super satisfied now with the regear and the chip from how it was riding before, but I just need a little bit more.... just on the top end....

[kchummer]

The K&N is a waist of money IMO....I was tired of the growl and hiss it put out and when temps were in the 100's, I feel the design of the K&N lets in too much hot air from motor/plus 100 degree weather that it hindered performance more than helped...so I went back to stock setup....The Volant is probably the best since it's a totally sealed design, yet is more freely flowing than stock...just my 2 cents before you spend a lot of cash

[IRA51]

K&N and all Oiled filters let more dirt pass than OE paper filters . They will only have a litle more flow above 35000rpm's on a stock engine. If you send your oil out and have it anilised (spelling) you will se an increase in silicats with a K&N over OEM filters . Been there Done that .