I have an Edelbrock triangular filter now, it has been on the car since I bought it and now probs. But now hits with the rpm intake. The rpm is only supposed to be 5/8" taller than the Performer and I had a 3/4" spacer with the performer so this set up should be 1/8" shorter but it touches. Maybe the KRE heads are taller than the #48s I had on before.