Quote:
Originally Posted by chefdave
exhuast measurements on diameter front to rear show at least 3 different diameterbecausesthe . narrowest is over axle with 1.5 inches outside on a crushed bend so internally more like 1 1/4 inches to 2 1/4 inches. best diameter for system is 2 1/4 inches so my engine is being sufforgated by exhaust. also this diameter has been quoted on several websites for toyotas as giving a 20% improvement in mpg. hopefully sort exhaust and tidy back up aerodyamically should see a consistant 20mpg +.
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Congratulations on the good work
If your exhaust is a funky shape and variations of diameter, you'd better consider alternative routing because the current routing will probably not work with a bigger constant diameter : your motor home engineers did not waste time and money for the fun of pissing of owners ...