i am looking into getting a diffuser i have the iss forged des exhuast set up and i have read a couple
threads here about fitment issues with the iss forged which diffusers fit best , im leaning more towards the arkym

 

Please refer to those threads. I posted a similar thread and found that no fitment issues remain, only installation complications.
A good way to install would be to remove your axle back portion and wiggle it through after diffuser installation.

 

it has been confirmed that both the tom's and wald diffuser will fit, but not to say that it would be easy. Personally when i did my install (ISS Forged/Toms diffuser) i removed my bumper and then installed the exhaust, then the bumper. I found that was the best way in my situation.

 

i havnt found a thread that talks about iss fitment and the arkym diffuser its all been toms and wald

 

Iss forged des with arkym diffuser on my isf.
Little tight on exhaust tips but not too bad i hope this would help you.

 

Iss forged des with arkym diffuser on my isf.
The fitment is really good, looks way more better in person.

 

That looks nice!

 

more pixxx.

 

^^^ That does look nice!

 

^ Looks Sexy!

 

I have the Wald and the fitment is super tight but possible

 

i have Wald rear. removed the rear bumper (took 5 minutes to do), installed the diffuser onto the bumper directly while bumper was off the car, slid the bumper back in place, exhaust tips fit just fine.

I had a buddy helping me, which REALLY helped. Doing it along would've been very tricky.