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07 Kia Sportage 2WD, V6, EX
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2 1/2 is way too large!!!!
Here is a chart for dual pipes.
see the single pipe colum
Exhaust Pipe Size Estimate: A good section of straight pipe will flow about 115 CFM per square inch of area. Here’s a quick table that shows how many CFM each common pipe size will flow, as well as the estimated max horsepower for each pipe size:
Add these ARE MAX hp....which you will never even be close to.

Pipe Diameter (inches)1 3/4, 2 , 2 1/4

Max HP Per Pipe 108, 144, 185

Max HP For A Dual Pipe System 215, 289, 381

NOTE: These numbers are just estimates. All pipes are assumed to be 16 gauge steel.

The table above is probably over-estimating pipe size, but you can see that a 400 hp vehicle with a dual exhaust system only needs 2 1/4 – 2 1/2 inch pipes. Anything larger is overkill.
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