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Ok, I had the dual exhaust system removed from my Chero today. It was rusted out and had to go. Anyway, the dual system had 2.25 inch pipes going into glass packs with the pipes exiting in front of the rear wheels. The new system is a 2.5 inch press bent, over the axle, single pipe with an OEM type muffler. The results, less noise and a little less power.
When I drove home, the engine was running rich and was bogging down during accelleration. Got home and adjusted the air/fuel ratio which got rid of the bogging and seemingly restored much of the lost power. However, after running errands all day, I would have say that there was a decrease in power. Not a big drop off, but the engine doesn't seem to rev quite as freely or pull quite as hard. There definitely was a change in back-pressure or I would'nt have had to readjust the carb.
I am going to run with the single pipe for a while and than will probably run a second exhaust pipe side by side over the axle with the current pipe and modify the factory y-pipe to form an x-pipe crossover. There is enough room underneath to run the second pipe. However,I have the feeling this may be overkill. Maybe all I really need to do swap out the OEM type muffler for a Dynomax.
As a side note, I was suprised at how easily and quickly the exhaust shop guys could bend pipes. When I went to the shop I brought a factory y-pipe scavenged from a junkyard and a Flowmaster Universal 2.5 inch tail pipe kit with me. I really thought it would be tough for a shop to custom bend an exhaust system. The guy just laughed (good naturedly). So we take out the Flowmaster kit and find that it only clears the axle by a few inches (maybe 3). The shop guys says this isn't enough for offroad use and I agreed. He then went on to bend up, and install a custom over the axle system in a little over an hour. The pipe bending part took maybe 10 minutes. The total cost for the whole job, parts and labor ran $160. I returned the Flowmaster system to the local "speed shop." For So. Cal. residents the muffler shop I used was Baja Mufflers on 14200 Inglewood Blvd in Lawndale. Also, prices for exhaust work vary dramaticlly around here. Some shops I called quoted more than twice Baja's price.
[This message has been edited by Dave _S (edited May 05, 2001).]
When I drove home, the engine was running rich and was bogging down during accelleration. Got home and adjusted the air/fuel ratio which got rid of the bogging and seemingly restored much of the lost power. However, after running errands all day, I would have say that there was a decrease in power. Not a big drop off, but the engine doesn't seem to rev quite as freely or pull quite as hard. There definitely was a change in back-pressure or I would'nt have had to readjust the carb.
I am going to run with the single pipe for a while and than will probably run a second exhaust pipe side by side over the axle with the current pipe and modify the factory y-pipe to form an x-pipe crossover. There is enough room underneath to run the second pipe. However,I have the feeling this may be overkill. Maybe all I really need to do swap out the OEM type muffler for a Dynomax.
As a side note, I was suprised at how easily and quickly the exhaust shop guys could bend pipes. When I went to the shop I brought a factory y-pipe scavenged from a junkyard and a Flowmaster Universal 2.5 inch tail pipe kit with me. I really thought it would be tough for a shop to custom bend an exhaust system. The guy just laughed (good naturedly). So we take out the Flowmaster kit and find that it only clears the axle by a few inches (maybe 3). The shop guys says this isn't enough for offroad use and I agreed. He then went on to bend up, and install a custom over the axle system in a little over an hour. The pipe bending part took maybe 10 minutes. The total cost for the whole job, parts and labor ran $160. I returned the Flowmaster system to the local "speed shop." For So. Cal. residents the muffler shop I used was Baja Mufflers on 14200 Inglewood Blvd in Lawndale. Also, prices for exhaust work vary dramaticlly around here. Some shops I called quoted more than twice Baja's price.
[This message has been edited by Dave _S (edited May 05, 2001).]
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