Does removing cat improve performance?
#1
Does removing cat improve performance?
Hello to all! A guy I work with has a 2001 GS400, and his rearmost catalytic converter (intended to lower emissions even more) was making noise so he took it to a muffler shop, where the guy told him it'll run better when that 3rd cat is removed. I'm wondering if the ES350 exhaust system is designed the same way so I can do the same thing to the 2011 ES350 I got about six months ago. If any of you can give me some feedback, I'll appreciate it greatly. Thanx in advance, jj
#2
Hello to all! A guy I work with has a 2001 GS400, and his rearmost catalytic converter (intended to lower emissions even more) was making noise so he took it to a muffler shop, where the guy told him it'll run better when that 3rd cat is removed. I'm wondering if the ES350 exhaust system is designed the same way so I can do the same thing to the 2011 ES350 I got about six months ago. If any of you can give me some feedback, I'll appreciate it greatly. Thanx in advance, jj
#3
Your buddies car would seem to run better because the old cat was damaged and/or partially plugged. There are various aftermarket cats that are less restrictive which would give a little better performance but is hardly noticeable. In today's engines the performance improvements are gained by remapping the engine parameters in the ECU. But then again an ES is not a performance car so it's not worth exploring.
#5
My past experience with 3-cat setup (two in headers and 3rd as clean-up secondary): removing the secondary 3rd cat and resonator will gain you up ~10 HP and lots of dB. The true gains are in having free flowing headers and Y-pipe and those with proper ECM tuning will get you ~30 HP.
Camry forums have some of this info as well. Quick google search yielded this thread:
https://www.toyotanation.com/forum/1...exhaust-3.html
Camry forums have some of this info as well. Quick google search yielded this thread:
https://www.toyotanation.com/forum/1...exhaust-3.html
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