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2.5 exhaust system on stock manifold


 
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honesT
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Joined: 12 Nov 2010
Location: Coquitlam B.C. Canada

PostPosted: Fri Nov 26, 2010 6:30 pm    Post subject: 2.5 exhaust system on stock manifold Reply with quote

Hi, I`m new here & to the jeep world...
I own a 1996 XJ and have bought a used highflow exhaust system from bottom of manifold flange to tail pipe off a 91 xj that had a stroker engine...

My question is can I just bolt this on to my stock manifold or is the 2.5 pipe to wide and won`t give proper back pressure. My stock front pipe is 2 inches outside diameter for the 1st 20 inches then expandes to 2.5 inches outside diameter for the rest of the length.

4.0L I6 MPI "Power Tech HO" (High Output) - 190 hp @ 4750 rpm, 220 ft lb @ 4,000 rpm - used in 91-95 and updated in 96-01 to 225 ft lb torque @ 3000 rpm
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FARMER
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Joined: 29 May 2007
Location: Benicia Ca.

PostPosted: Sat Nov 27, 2010 9:04 am    Post subject: Reply with quote

Any changes in exhaust size will affect torque/horsepower regardless of stock manifold or header. A larger free flowing exhaust will give you more top end horsepower while a smaller restrictive exhaust increase the torque on the low end of the RPM range. The question really is how do you drive it? If it is a trail beast then stay with the smaller one, if it is a highway cruiser go with the larger one. If it pulls dual duty and you're not out rock crawling the larger one will probably work for you just fine. It's all about what you need it to do.
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honesT
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Joined: 12 Nov 2010
Location: Coquitlam B.C. Canada

PostPosted: Sat Nov 27, 2010 8:10 pm    Post subject: Reply with quote

Thanks for that reply, It is the most informative repsonse I have had yet and I`ve posted this on about 5 forums total...
Most people are just saying do it u should be fine???

Thanks again for your time Very Happy
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