When I bought my car, it had already 2.25" exhaust all the way back to the muffler...this muffler has rusted out. I picked up a stock muffler today and my idea was to install it...but then got to reading, will the stock 1.75"ish stock muffler cause issues? This is my daily driver, and I want to keep my MPG as high as possible..

Any opinions??

1998 EX

 

No, it won't cause issues.

 

Depends on your power level.
If you have a stock engine, and switch to stock muffler, you may actually gain some low end/mid range power.

I noticed my small turbo D16 was obviously being choked\held back in the mid range to high, when I went to stock pipe and muffler.
Went back to 2.5 the next day, no look back.

 

Exhaust is going to open your cars air flow up ... More power and better mpg

 

Wouldn't recommend it. You can get aftermarket that looks stealth and still maintain performance.