This is my somewhat modified setup. The inline needle replaces the restrictor and allows me to open it up a bit for a quicker boost rise. The small check valve that comes with the kit locked open on me on occasion...I think from the heat. This is a distributor check valve and is much more robust. The Napa part number is 2-970 out of the CRB line. With the two valves I'm able to dial in a quick rise in Fuel Pressure and still hold the top end pressure down. Running 1.8L injectors on my 1.6L w/stock timing I've got 12psi boost with no pinging in hot weather! [UPDATE: later in 100 plus temps and more advanced timing and CA gas I got pinging. You MUST lower the boost if this occurs until cooler weather returns. NO pinging is acceptable. A small ping once in a while is NOT acceptable. Trust me.]