Will a milltek decat for my piper cat back. As I've just bought one but aatr has said it might not fit

aatr has said it might not fit

 

How do you pronounce the name 'aatr', I'm struggling to form the correct sounds with my human mouth? 

How do you pronounce the name 'aatr', I'm struggling to form the correct sounds with my human mouth? 

Maybe it has a silent A and a R.

Yeah that's meant to say mate that's what I get for quickly writing it at work. Any advice on if it will fit would be a help before I try

Well it should fit because it's a straight swap for the standard cat, is your mate with the unpronounceable name an expert then?

No but he thinks he is lol just got me thinking and wanted to make sure before I start trying to fit it. It's the first time I'll of fitted a downpipe so will just see how it goes

If it doesn't fit I'll have it lol.

If anyone wants this let me know