canman47 Posted March 15, 2014 Share Posted March 15, 2014 I tried a search for exhaust and couldn't find anything for the V6. I just bought this 92 Spirit and the muffler is leaking so will need replacement soon. Can anything be done to improve performance and hopefully gas milage? I know that a big free flowing exhuast is not good for low end torque but the original is probably restrictive. I won't be replacing the cats (there's two) so its from there back. What's optimum? Quote Link to comment Share on other sites More sharing options...
WME Posted March 15, 2014 Share Posted March 15, 2014 The restriction in the v-6 exhaust is the crossover. If your in a non inspection state have a local shop fab a set of duals. If that wont work then an aftermarket v-8 truck muffler and a 2.5" pipe Quote Link to comment Share on other sites More sharing options...
DanAatTheCape Posted March 15, 2014 Share Posted March 15, 2014 I would not modify it - you will find that the muffler is on the driver's side & the gas tank is on the pax side. Everyone wants to re-engineer these things - it is what it is. If that is not to your liking invest in a new diesel camper - you can spend a lot trying things but in the end .... Quote Link to comment Share on other sites More sharing options...
Vanman Posted March 16, 2014 Share Posted March 16, 2014 If it was so simple and easy to get more more outa it don't you think Toyota woulda done it in the first place. Years of racing taught me the golden rule: CHANGE IS EASY, IMPROVMENT IS HARD. Getting a motor to breath better will involve modifications to more than just one end. Most cost effective change would probably be changing the rear end ratio. john Quote Link to comment Share on other sites More sharing options...
fred heath Posted March 16, 2014 Share Posted March 16, 2014 You could always try a NOS system. Bet it would help on the hills. Quote Link to comment Share on other sites More sharing options...
Pete1122 Posted March 16, 2014 Share Posted March 16, 2014 I agree with changing the gears, I just put in 4.56 in my 1989 Toyota Warrior, the improvement was major! I went from feeling like I was driving a overloaded Uhaul to feeling like I was driving around in a regular pickup truck. Best money I spent on the motorhome.... period. Quote Link to comment Share on other sites More sharing options...
chefdave Posted March 17, 2014 Share Posted March 17, 2014 More info on exhaust. understand 2 1/4" is best diameter for exhaust and cats can be replaced with a freer flowing design. on another forum for hilux this has been quoted to improve hp and fuel efficentcity. cross over removal improves low end torque and helps with over heating of no6 cylinder which is one cause of hg failure Quote Link to comment Share on other sites More sharing options...
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