I found a local magnaflow catback for my 1998 civic ex at a killer deal, but the guy claims it is a 2.5" exhaust. I know everyone says that you should get 2.25" if your NA, but would I lose any performance by going 2.5"?

 

no one?

 

If it really is a magnaflow then it is a 2.25"

 

^^ that is of course if he wasnt just talking about a magnaflow muffler with welded on piping. (he did say he found it locally)

 

^^ True story, custom piping with magnaflow muffler is popular, and you will be ok with a 2.5, its not ideal but dont go above 2.5 on N/a

 

I know we are talking d series right now but just an fyi for anyone who doesn't know... 2.25 for n/a d series, other seriesneed bigger.

 

2.5 should be the absolute maximum diameter for N/A engines.