Hi im getting a 98spec type r header and going to modify my cat so that it would bolt on since the collector for the header is 2.5. which one would be best to get. here are the sites

first choice:
http://www.robearracing.com/pd_ss_do...iversal_25.cfm


second choice:
http://www.robearracing.com/pd_stain...iversal_25.cfm

thanks

 

Go with the donut flange. The other one won't seal correctly with the header.