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If the tubing is 3inches or more, yea it affects it. 2.5 inch if you dont have turbo, other than that, youve gone too big.
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Yeah, I guess if you don't want the extra hp you should go with 2.5". But if you're not a retard, it should be 3". A 3" on KA usually gives around 10-15 hp. Forget what the old v8 guys told you. Even on the tiny B16, replacing the secondaries with a 3", 3-foot, dump pipe exiting the car, will yeild around 14hp and 12 ft-lbs tq. Get the biggest exhaust your app will allow. Your header should keep good exhaust gas velocity.