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Why does my car struggle?

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baz88

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My cat does not run as smoothly as it used to and now struggles a fair bit and is pretty obvious. The car is a Nissan 190sx with an sr20 blacktop engine with ball bearing turbo and front mount intercooler. I can't exactly remember when it started but I think it might have been when I sawpped my exhaust for a standard much smaller exhaust. Could I be right to assume that this could be the reason? Something to do with air release or power build up without a proper means of exit or something along those lines.

Also on initially take odd when my engine is cold I cannot accelerate. I press the gas and the revs do not move until a few seconds and I cannot take off. I notices it started after summer and when the car has been off for a few hours.

Any ideas?
 
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Yeah your post is somewhat confusing. If its happened since changing exhaust id say either a gasket has gone or the bore size is different causing a dramatic change in backpressure ?
 
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