Super easy install on my 2021 wrx. Took about 15 minutes to install. Setting up the tools and my car took longer. The car now makes all the pops to make me smile. First gear pops the loudest along with second. Aggressive downshifts to third I get small pops. You can hear the exhaust in the car with windows up at 3k rpm’s. I’ve added 2,000 miles within the month I’ve owned it. A lot of highway driving, wouldn’t call it drone but the exhaust is present in 6th gear 3k rpm’s going 80mph. Windows down is a whole other story it will really make you like the exhaust and yes cold starts it is pretty loud. You can hear it from inside from about 4 car lengths from your house but you have to listen for it. Hope my review was detailed enough to help anyone decide to make the purchase or not. It is just loud enough for my fiancé to approve.