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My 92 toyota OEM muffler is huge but rather quite (less noise than most cars of similar size). I was thinking about some sort of resister at the end to see if low rpm fuel usage would be any better or not, but I'm not sure if it even would help. My car warms up in about 1.5 miles of driving with 1 stop at 1/2 mile and average speed of around 50mph (country driving). I would like quicker warm up temps (no areo mods yet) since my car holds 3rd gear until it comes off cold on the temp gauge. Not even sure if it is the car computer controlling it, or the cold transmission fluid moving too slow to make the shift. As soon as it hits the temp, it instantly goes to over drive and lockup at the same time, and drops from around 3k rmp @ 45-50mph to around 1800 rpm. If I could get it to shift quicker, I wouldn't be hitting such high rpms, but could be assisting the quick heat up (rpm is under 2200 ~70% of the driving though).
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