hey im looking to get a catalready with o2 bungs but im not sure if i should get a 2.25 or 2.5 i currently have a thermal exhaust and im not sure wat size the connector is and am plannig to get a greddy 421 header will althis match up with a 2.5 or should i stick with the 2.25 thnx
for my 97 gsr

 

run on sentences are gaaaaaaay...lol sorry man. i believe to 2.5 would be good but check all the sizes first......id go with the 4-1 header. better!

 

2.50 is ok

 

i was doing some research on TI and some one said that going 2.5 to the 2.36 exhaust would be bad. They said that it causes restrictiongoing from smaller to bigger is this true?

 

i meant bigger to smaller* such as 2.5 to 2.36

 

...obviously 9 feet is smaller than 10. so yes, 2.36 is smaller than 2.5. Get a jdm ITR header, cheap and good flow!