Quote:
Originally Posted by fullthrottlesrqsupra
one full size all the way back actually ending up a tiny bit smaller at exit
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Actually, you want to start out smaller and end up larger. After combustion you want a smaller diameter pipe to maintain the velocity of the hot exhaust gasses. The further the gasses travel, the cooler they get. When the gasses cool down, their velocity decreases causing more restriction in the flow. To avoid this, you increase the pipe size, allowing more gasses to occupy that portion of the pipe.
So, start smaller, end bigger.
Let the arguments begin lol 
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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