I am installing a new OS 1.60FX in my Sig Cap 231EX. I will be installing a Slimline Pitts style muffler on it. I have read that in order for the engine to run really well with the Pitts style muffler I will need to use a pump. I am just wondering what pump I should use? I have read the Perry pump works well but they make two kinds of pumps, which one do I need? Thanks in advance!!

Tony Gagliardi Jr.