Have a Veilside that does and now has to go. I am sure Mazdaspeed doesn't require removal since the diffuser is just an add on to the stock back bumper so it is high on my list. Any others that do not require crunch bar removal???

Time

i assume you're talking rear? the ms def doesn't require removal

R-Magic like the MS is just the lower half of the bumper.

ings rear only requires replacing the exhaust shrouds

but the ings front does

Yes, rear is the convo...

Kenstyle rear bumper requires removing crunch bar? Fabulous?

Ugh... none of them should. Just trim the bumper around them. Technically with the front ones, you need to remove the bar, but if you just trim the bumper where it touches the bar, you don't need to remove it.