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This custom exhaust 4-2-1 system formula was given by Chin Fa Cheng ( www.my-acoustic.com)
this is a 4-2-1 system , at the 4 part is 1.35m long with 1 .5/8" diameter tube , and the 2part is 0.5m long with 1.5/8" diameter tube , and the final pipe is 2" diameter all the way to the rear muffler,
after done it and test drive it found the engine rev up very fast & light , and the power start coming out after 3.5k RPM all the way to 8k RPM , especially after 5k there are strong power coming in to 8k,
4 dec05 there was drift event at PD , went all the way 140km ~180km , after the event found the fuel consumption is about 11km / 1L , wow very low fuel consumption , I believe if I drive at 110km on highway can get 15km/1L
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this part is 1.5/8" diameter x 53" long
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same long with the gear box for the 4 part
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this the 2part 20" long x 1.5/8" diameter
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the Co2 sensor is located at the final pipe under rear seat
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the final pipe is 2" diameter
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add a mid box after Co2 sensor to reduce the noise , now the noise level is 80% reduced
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switch the Co2 sensor to #2 cylinder port , before this it was install at final pipe & take very long times to warm up, after switch to front only take few min to warm up at morning
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