The 4.0 is a great motor for a Jeep. It's reliable, durable, has tons of low-end power, but if you want a hotrod motor, you'd better just swap in a V-8. All that high-flow intake and exhaust crap is really just overpriced, gimmicky B.S. for a Jeep--you'd have to modify the motor before you'd even begin to get your money's worth out of it.
I agree with those that suggest a gear change to compensate for larger tires. Larger tires are essentially equivalent to running taller gears, so that only makes sense. Besides, even in the hotrod world, it's well known that a proper gear change will yield better bang-per-buck than just about anything else. If I were looking for something to bolt onto my engine, I'd get some full roller rockers in there, which will give you more power and reliability by taking more friction and flex out of the equation. That's a good bolt-on upgrade, and Summit has Harland Sharp for about $330.00.
If you're thinking of paying $300.00 to $1,000.00 or more for engine performance, but aren't willing to open up your engine or regear, I'll sell you a case of snake oil engine treatment...
I agree with those that suggest a gear change to compensate for larger tires. Larger tires are essentially equivalent to running taller gears, so that only makes sense. Besides, even in the hotrod world, it's well known that a proper gear change will yield better bang-per-buck than just about anything else. If I were looking for something to bolt onto my engine, I'd get some full roller rockers in there, which will give you more power and reliability by taking more friction and flex out of the equation. That's a good bolt-on upgrade, and Summit has Harland Sharp for about $330.00.
If you're thinking of paying $300.00 to $1,000.00 or more for engine performance, but aren't willing to open up your engine or regear, I'll sell you a case of snake oil engine treatment...
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