[ibo]

I was going to install my Performance Diffuser after thoroughly going through the official instructions posted here many times. I realized that the one piece to trim off is only written into the instructions on the LEFT side and not the RIGHT side. Looking at my performance diffuser, it seems that both sides are symmetrical, as is my plastic bumper cover. Therefore, I'm wondering if I need to cut BOTH the left and right side of my bumper instead of just the left.

Probably a dumb question, but I just want to be 110% sure about this before I proceed.

For those of you that installed it correctly, can you give me let me know please? Thanks in advance!

[Whitevdub]

+1, i'm curious about this too...i have one sitting around waiting to be installed for my e90 328i

[ibo]

To supplement whitevdub's question from the other thread, has anyone put the OEM diffuser back on after making the cut-outs for the performance one?

[spdy330]

Hope this helps: http://www.e90post.com/forums/showthread.php?t=447947

[ibo]

Originally Posted by spdy330

Hope this helps: http://www.e90post.com/forums/showthread.php?t=447947

Appreciate your effort to help, but that really doesn't answer the question I posted. Also, that thread was started by Whitevdub, who is second to post here in this thread, as his question also remains unanswered

Thanks though.

[Whitevdub]

Originally Posted by ibo

To supplement whitevdub's question from the other thread, has anyone put the OEM diffuser back on after making the cut-outs for the performance one?

i can't seem to get an answer for that one..i pm'ed Longtran but he said i can and another member said its not possible..there are no straight answers haha

and for the cutting, Longtran also just said the left side of the bumper just has to be cut, no one said anything about the right side as well. we need someone with experience on this

[ibo]

Originally Posted by Blistex

Yes! you need to cut the left and right corner of the bumper in order to install the performance diffuser correctly.

Thanks!

Originally Posted by Whitevdub

i can't seem to get an answer for that one..i pm'ed Longtran but he said i can and another member said its not possible..there are no straight answers haha

and for the cutting, Longtran also just said the left side of the bumper just has to be cut, no one said anything about the right side as well. we need someone with experience on this

Well I went ahead and took off my OEM one and Blistex is right. There is no way the diffuser can fit without cutting the right side as well.

As for your question, I think the OEM one will fit, but it probably won't be as snug on the edges because with this cutting, you are essentially eliminating one clip on each far end of the bumper. The center six clips are plenty strong though. The reason why the Performance one will hold is because the LEFT and RIGHT edges stick out (upward and outward) and will get caught BEHIND the bumper cover, preventing those edges from coming out.

I hope this answers your question to some degree.