Hi,

if I have a 3” exhaust system - catback....and a 3” decat downpipe........but the connection between the two sections is a 2.5” taper......how detrimental will this be to flow / power / results during mapping??

would this concern you guys or is this permissible??

cheers.

i believe a 2.5 inch is good for over 400 bhp , so unless you are after big numbers i don’t even think you would notice , it is as it is