Exhaust system from scratch - JeepForum.com

 
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post #1 of 13 Old 10-25-2011, 02:09 PM Thread Starter
armystrong68w
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Exhaust system from scratch

Instead of buying an $800 exhaust system, could someone handy with welding make their own from tubing? and where would be a good place to get the tubing, can you buy it at NAPA or some place similar?


****Before i had a jeep I didnt know why you guys parked in snow banks and made sure to hit puddles and mud but now i understand....It really is a Jeep thing!!!!!****
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post #2 of 13 Old 10-25-2011, 06:18 PM
w4rh4wk
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mine wasnt $800 it was $400 (off of ebay) ... you could... someone a while back basically bought his own muffler and had it swapped it out for the stock muffler... you figure muffler ~$100-$150 + materials + labor.... get some prices and take a look at some universal mufflers... i almost did a custom exhaust on mine.

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Pioneer AVIC-X910BT Radio + Jensen JCAM1 Rearview Backup Cam, K&N 63-1567 Performance Intake , Magnaflow Exhaust Part #16777 (Yes it will fit on a 4x4 2011 Compass), Mopar Chrome Fuel Door, Cargo Area Security Cover, Husky floor mats, Mopar Front & Rear Molded Splash Guards
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post #3 of 13 Old 10-25-2011, 06:29 PM
tjkj2002
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The OEM exhaust and most aftermarket cat-back systems are mandrel bent and that pipe bought at parts stores is not.Big difference in flow rate between mandrel bends and non-mandrel bends,reduction can be as much as 25% for non-mandrel bent pipe.Plus the aftermarket systems are designed to still work with your engine to keep the exhaust pulses the same or improve them(free's up some HP,not much though).

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #4 of 13 Old 10-25-2011, 06:40 PM Thread Starter
armystrong68w
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Cant i use the same pipe? and just replace that huge mother F**ker of a pillow we have as muffler? or is there no gain in HP/MPG from that?

****Before i had a jeep I didnt know why you guys parked in snow banks and made sure to hit puddles and mud but now i understand....It really is a Jeep thing!!!!!****
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post #5 of 13 Old 10-25-2011, 06:47 PM
tjkj2002
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Originally Posted by armystrong68w View Post
Cant i use the same pipe? and just replace that huge mother F**ker of a pillow we have as muffler? or is there no gain in HP/MPG from that?
Sure you can just replace the muffler.You will not gain any HP from it,just more noise depending on muffler used.You may "feel" more power but it is just the noise and the PCM will "learn" back to prior performance shortly anyways unless you reprogram the PCM to the increased flow.Then you got to free up the incoming air and internal working to get any lasting and measurable effect.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #6 of 13 Old 10-25-2011, 07:08 PM Thread Starter
armystrong68w
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ahh so useless unless i want to sound like a civic. which i don't. Basically i will have to get a "CAI" and have a shop work on custom headers and a have to buy a magnaflow cat back system and then have the computer updated if i want to see any difference?

****Before i had a jeep I didnt know why you guys parked in snow banks and made sure to hit puddles and mud but now i understand....It really is a Jeep thing!!!!!****
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post #7 of 13 Old 10-25-2011, 07:15 PM
tjkj2002
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Originally Posted by armystrong68w View Post
ahh so useless unless i want to sound like a civic. which i don't. Basically i will have to get a "CAI" and have a shop work on custom headers and a have to buy a magnaflow cat back system and then have the computer updated if i want to see any difference?
Yep and then you have to add some different grind cam(s) and head work(porting and such),may get 25-50hp and loose most of the low end power as the gain will all be at the high rpm range.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #8 of 13 Old 10-25-2011, 07:38 PM Thread Starter
armystrong68w
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stupid POS car... they should have used a more efficient I6 instead of the I4

****Before i had a jeep I didnt know why you guys parked in snow banks and made sure to hit puddles and mud but now i understand....It really is a Jeep thing!!!!!****
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post #9 of 13 Old 10-25-2011, 10:45 PM
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Agreed. Or perhaps an automatic.
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post #10 of 13 Old 10-26-2011, 08:19 AM
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You get what you pay for: a new computerized vehicle that meets the standards imposed by the g'ment that has VERY limited modification capability so that it maintains those standards. That's the way it is these days. You knew what you were buying and if you wanted an I6 then that's what you should have bought. It is what it is but I don't consider it a POS just because you can't turn it in to something else.

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post #11 of 13 Old 10-26-2011, 08:52 AM
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So... how do you reprogram the PCM after the exhaust and intake has been replaced? Do you have to take it to the dealer? Or does AutoZone have one of those programmers you can rent? Just curious.

I am thinking of replacing my exhaust with pipe and an aftermarket muffler from autozone, and I just want to be prepared. There's no way in hell I'm paying $400 for something I can do myself.

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post #12 of 13 Old 10-26-2011, 01:26 PM
w4rh4wk
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Quote:
Originally Posted by lidhead View Post
So... how do you reprogram the PCM after the exhaust and intake has been replaced? Do you have to take it to the dealer? Or does AutoZone have one of those programmers you can rent? Just curious.

I am thinking of replacing my exhaust with pipe and an aftermarket muffler from autozone, and I just want to be prepared. There's no way in hell I'm paying $400 for something I can do myself.
autozone isnt going to know how to performance tune your PCM. you need to find a dyno tuner in your area that does mopar. FYI dyno tuning can cost up too $400 because they might require you to buy PCM programer. Why do you need a dyno tune when doing PCM performance upgrade? Because you DO NOT want your car running too rich or too lean. This is why i never liked cookie cutter programming kits for any car's computer.... every car is different!

11 Mineral Gray Metallic Compass 2.4L, 4x4, Auto Mods/Addons:
Pioneer AVIC-X910BT Radio + Jensen JCAM1 Rearview Backup Cam, K&N 63-1567 Performance Intake , Magnaflow Exhaust Part #16777 (Yes it will fit on a 4x4 2011 Compass), Mopar Chrome Fuel Door, Cargo Area Security Cover, Husky floor mats, Mopar Front & Rear Molded Splash Guards
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post #13 of 13 Old 10-26-2011, 07:11 PM
tjkj2002
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Quote:
Originally Posted by lidhead View Post
So... how do you reprogram the PCM after the exhaust and intake has been replaced? Do you have to take it to the dealer? Or does AutoZone have one of those programmers you can rent? Just curious.

I am thinking of replacing my exhaust with pipe and an aftermarket muffler from autozone, and I just want to be prepared. There's no way in hell I'm paying $400 for something I can do myself.
You send your PCM to a place like in the link below.....

http://www.bgperformancepcm.com/

And yes expect to pay about $400 for the tune and kiss any warranty good bye.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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