What's mod is best for power and efficiency

[raptor_pilot]

I have a '93 YJ with a 6 cyl and automatic trans. What modification will give me the most bang for my buck? I'm looking to get more horsepower/torque and fuel efficiency. I was wondering who has experience with any of these diferent mods and any comments on them. Thanks as always.
Mike

[Craig]

The easiest and cheapest (free) mod is to remove the air restrictor. It's in the intake tube going from your airbox to the intake. Just pops out with a screwdriver. As for TBS, exhaust ect you probably won't notice very much of a difference with any one of these but put them all together and you should notice a difference. I found the snorkel on my jeep added a little to fuel efficiency and power because it acts kinda like a ram air and has a constant flow of cool, clean air. Even if I didn't use a snorkel for what it's supposed to be used for, I'd rather have the snorkel because you get both the snorkel and a cold air intake....and it's not much more $$$ than some of the cold air intakes on the market.

[redrooster]

Best bang for the buck is nitrous.

[yjdave]

Dont waste your $ on the TB spacers. Get a bored out TB and air intake for the top end and get a flowmaster and header(banks/borla/thorely)

[yjdave]

Best bang for the buck is nitrous.

BANG being the key work there........LOL.......LOL....LOL

[currupt4130]

Get an open filter (K&N or w/e), larger bore throttle body, headers, and something to open up the back end of the exhaust (catback, glasspack, w/e). Doing one end and not the other isnt getting the full potential. Just because you can dump a whole bunch of air in doesnt mean you can get it all out, and just because you can get a whole lot of it out, doesnt mean you can pull a bunch in. If you open up both ends of the system the (front is intake, rear is muffler AND headers) you can flow a lot more through the engine

[TwistedCopper]

Single mod: Electric fan conversion.

Most effective combo: K&N (or similar) Intake and full exhaust mods

[Utah_jeepster]

As most have stated three mods will improve your MPG and HP.
Cat back and bigger exhaust with a throatier muffler.
Cold air intake. (skip the throttle body)
The loose the mechanical fan and gain 12 hp with electric fans.

After that...regear your diffs, then loose the 3 speed auto and drop in a TH700R 4 speed auto.

[Spotfirecsi]

I just picked up a 93 yj same set up. I was worried about the auto trans offroad. Any problems you have noticed or advice to fix something before it becomes a problem?

[yjdave]

I like my TF999. I would like to have a 4sp, but your looking at big $$$ for a 700r and adapter for the I6. I would look into a shift kit to firm it up a little. Auto's don't like water to much, stay clear of the really deep stuff.

[88Wrangles]

The loose the mechanical fan and gain 12 hp with electric fans.

Maybe if you're stock mechanical fan weighed like 50lbs. In reality, you'll only gain a horsepower or two at the most.

[TwistedCopper]

Maybe if you're stock mechanical fan weighed like 50lbs. In reality, you'll only gain a horsepower or two at the most.

It felt like a near 10% increase in the 4 cyl YJ I had and I am not exaggerating. It was the only single mod that made an immediate noticeable difference.

[raptor_pilot]

I've heard stats that approach that on other vehicles as well. Thats a common mod for getting horsepower in muscle cars. You'd be amazed how much resistance air creates, and how much power is lost that way.