TRUE Dual for ISx50 (exhaust)
10-12-11, 10:47 AM
#16
Lexus Test Driver
dual 2.5 is waaaay too big for the is250. Hell, it's too big for the 350. I bet you lost a good amount of low end torque.
2.25 is reasonable but still too big really.
2.25 is reasonable but still too big really.
10-12-11, 11:08 PM
#17
Driver School Candidate
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10-12-11, 11:10 PM
#18
Driver School Candidate
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10-12-11, 11:12 PM
#19
Driver School Candidate
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10-13-11, 08:55 AM
#20
Lexus Test Driver
I just know that there needs to be some pressure on the exhaust side to maintain your low end torque. A true dual 2.5 system can flow enough air for a 6.0 Liter v8.
There is no way that a 2.5 liter, 6500rpm, NA engine needs NEAR that much back end flow. Like I said, 2.25 is technically more than enough for a 3.5.
There is no way that a 2.5 liter, 6500rpm, NA engine needs NEAR that much back end flow. Like I said, 2.25 is technically more than enough for a 3.5.
01-26-12, 08:31 AM
#24
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Modified Exhaust system
Hey everyone this is the modified cat back exhaust system. So basically we chopped the flexes out because it actually made the system shake. Also we added an x-pipe magnaflow. It toned down the sound a lot. Not sure of the power gain like most people said but it sounds great.
01-26-12, 09:49 AM
#26
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01-27-12, 01:30 AM
#27
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Nice custom exhaust setup 
. I love the weld job, very precise and clean. Care to share where in CA this shop is at? Anything I need welded I'll definately consider going to him first if he's local.
. I love the weld job, very precise and clean. Care to share where in CA this shop is at? Anything I need welded I'll definately consider going to him first if he's local.
03-09-12, 09:49 AM
#28
Driver School Candidate
2.2" is the EXACT size for maximum benefit on an IS250. I did 2.5" as well because it was in stock and i wanted my exhaust done. Doesn't really matter, neither would give a sufficient hp increase that onee can actually feel, but 2.5" allows u to supercharge in the future without the need for exhaust modification 
Btw we have very similar setups, except that i have an actual X pipe. Your welds are much nicer than mine though 
nice work! interested to see dyno results
Btw we have very similar setups, except that i have an actual X pipe. Your welds are much nicer than mine though nice work! interested to see dyno results
