Hi CL, I just bought a used Q300 axleback from a local member here for my 14' 350 (shout out to @CASeoul). Was wondering if anyone has experience on what hardware was used when installing it, as I've researched this and have seen conflicting answers.

From searching the forums, it seems most people reused their OEM hardware without any issues. However, I believe the nut cannot be reused, does anyone happen to know what size to purchase? I have seen some people note M10 - 1.25 and others M10 - 1.5. Apologies if this has been answered before as I wasn't able to find a definite answer. Thanks!

 

Your best bet is to contact Invidia to get the size or just bring the OEM bolt to a hardware store and find a nut for it.
If you're not doing the install, any muffler shop will have that nut in stock.

The nut from the OEM axle back cannot be reused since it's welded onto the pipe.

 

Highly appreciate the response and confirming that I can't reuse the OEM nut as it helps me better prepare for the install!

 

I installed mine today (on a 2017), that's how I know haha!

Also, have some PB blaster ready in case the bolts are seized, 14mm socket/wrenches, channel lock pliers and a spray for the hangers to remove them and you're set.