A little update, it's been almost 4yrs since I made these upgrades. Last year my flex pipes were leaking, so I did a quick fix that only last few months(one flex pipe). The other flex pipe just started to leak this week a year later. Within these four years several leaks were fixed on the OEM pipes. After all that she still sounding like this.

Early Spring 2021 I'm planning to do a custom setup from CATs to the resonator(these pipes are old and will probably leak again). This will most likely lead me into getting an axle back afterwards. But I'm not sure on which brand. I originally want FI cat back, but my CATs are welded to my flex pipe. Shop suggest just to get axle back, cause if you get anything else they still have to cut it.

 

If you want to keep it quiet or OEM+, and I'm guessing you do since you've been running OEM catback, here's a couple videos with RHFC and Q300 catback with intake upgrades and tune:

https://drive.google.com/file/d/17lM...ew?usp=sharing

https://drive.google.com/file/d/17m6...ew?usp=sharing