So my shop called me and told me that my parts when simply bolted on are causing the system to hang pretty low underneath the cabin.

Anybody have any fitment issues like this when pairing Invidia HFC's with Stillen Cat Back?

I am waiting on pics now.

 

I have the stillen catback but with fast intention resonated test pipe. The resonator which is presumably in the same location as your HFC, is the lowest point of the exhaust system in my configuration. I will scrape it on extreme angles and I would consider my car lowered more than average. Check my build thread for pictures.

 

The shop is going to do some welding work for me to bring everything in line. I'll post some pics when I get it.