A Few of My Favorite Mods Use “MikesMods” in the coupon code at checkout to receive 10% off your order. These are great for day to day use and I also use them for autocross racing. AEM is a leader in gauges and I use this one for my boost reading and I also have one for my Wideband Air/Fuel Ratio reading This is a very affordable vacuum pressure test kit to find coolant leaks. You can also use it when adding coolant to remove air bubbles. I tested 4 products to clean the chrome exhaust tips on my car, and the P21S product was the best hand’s down. You can check out my comparison video here. If you’re going to use aftermarket gauges, this is an easy way to mount them on your driver A-Piller.