Ive got an E90 M3 ARB fitted, cant imagine the E93 is any different. Was actually considering further upgrade as I reckon its a bit more boaty than it needs to be on track but on the road its

 

So hopefuly the coupe and convertible are the same fitment then
Yeah I couldnt decide between the m3 bar or the 15mm non m bar but this one was pretty cheap and I’ve always had a tendency on previous cars to go too far then dial it back and this is only a road car

 

I believe the E93 bar is 15mm, which I guess is what you’ve gone for? The E93 M3 is 23.6mm, whereas the 1M and E90/E92 M3 have a 22.5mm rear bar. I’ve read that the 15mm bar is a good balance between controlling roll and maintaining traction without a diff’, you’ll probably need new ARB bushes, but should be a nice upgrade!

 

Yeah it’s the e93 convertible bar that I’ve ordered and I’ve already got new bushings on the way ,I’m sure they will be crusty and it’s sounds a relatively big job to fit there is no way I’m using crusty ones