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Old 02-15-2014, 04:52 PM
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My 99 xj has no muffler. Just straight piped. How much hp does this add?
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Old 02-15-2014, 04:58 PM
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40 on a 4.0L and 25 on a 2.5L
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Old 02-15-2014, 05:06 PM
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About 125+ decibels at WOT.
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Old 02-15-2014, 05:13 PM
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Thanks!
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Old 02-15-2014, 05:14 PM
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Would a better cat and headers improve the hp
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Old 02-15-2014, 05:16 PM
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A high-flow cat will, headers effect the KW and TQ the engine makes
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Old 02-15-2014, 05:18 PM
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So like high flow cat will prove hp and headers will increase torque
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Old 02-15-2014, 05:18 PM
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Kw?
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Old 02-15-2014, 05:21 PM
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Old 02-15-2014, 05:24 PM
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What's with this guy and horsepower ? Does he realize he bought an XJ not a WRX ?
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Old 02-15-2014, 05:37 PM
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Originally Posted by Nothing-2-Deep-4-Cherokee
My 99 xj has no muffler. Just straight piped. How much hp does this add?
Straight piping doesn't really do anything for performance. These motors are tuned almost to their limit as is. But you can do small things like relocate AIT, different injectors, good high flow exhaust (Header, high flow cat and cat back exhaust) and high flow filter to help increase your throttle response. These motors are nothing more than "tractor motors" designed for torque more than horsepower. If HP is what your goal is, I suggest a stroker kit or engine swap. Either one will cost you a good penny.
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Old 02-15-2014, 05:40 PM
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http://jeepm62superchargerkit.blogspot.com/
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Old 02-15-2014, 06:36 PM
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How would I increase torque
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Old 02-15-2014, 06:38 PM
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Originally Posted by RubberSideUp
Nice. Ranked in the pricey category.
Last edited by Outlaw Star; 02-15-2014 at 06:53 PM.
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Old 02-15-2014, 06:52 PM
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If that's too expensive, email Dave at DT Machine: dtmach40@hotmail.com

He sells M90 supercharger kits for 4.0Ls at $1000. Great foot in the door kit.

Video of the kit installed:

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