brntorangehatch
Member
Ok I have a completely stock gsr sedan... i just bought an AEM cai for it and also a DC jdm 4-1 header(2.5" collector)... Now my question is would it be better to go with 2.5 inch for the exaust too? or go with 2.25 inch?...If you know of any positives or negatives to either please let me know...