exhaust back pressure
i recently bough an 07 2 door jk and decided to drop the muffler to see what it sounded like...supprizingly its not very loud, and its deep. however, i didnt notice the torque seemed flat under 2000rpm. the cats are still on, so i figured there would be enough back pressure. has anyone else noticed this? i like a deep sounding jeep..who doesnt, but at the cost of performance im not sure its worth it. opinions?
Without a muffler you'll lose backpressure which will affect your low-end torque. Taking off the muffler is a trade-off to acheive more open flow at higher RPMs where backpressure would start to work against your engine. If you want the deep sound you are probably better off going with an aftermarket muffler that will still provide some backpressure so you have the low end torque for off-roading.
an aftermarket "catback" system is the best compromise of back pressure for max torque though often at a compromise of sound inside and out, ...the stock exhaust seems fine and mufflers don't wear out w/ unleaded fuel use much anymore, perhaps the stock exhaust with a similar fitting aftermarket muffler might gain something but, I like the quiet now in my life and the ability to listen to the radio at a low volume. The new JK's do just that!
A well know phenomenon in racing and motorcycles - open pipes (called drag pipes) are loud and help high end rpms and power, but really hurt at the low end. I second a cat back system if you don't like the stock sound.
08 JK 23S - Colorado Jeep Club No. 204
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Originally Posted by Rescue13 View Post
|exhaust , JK Wrangler , low end torque , system , Torque , wrangler|
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