My RW dyno results with a single carb on the
Modman

Carb was a 800cfm AVS THUNDER

KN 14x3 with Xtreme lid - 318 RWHP

MOROSO 16x3 - same day - 333 RWHP

No air cleaner - 277 RWHP

KN Hemi dual quad 2" high - twin AFB 500s - 358 RWHP

Two lessons Ive learned over time...

1 - Carters hate being run without an air bell or cleaner.

2 - Xtreme lids rob HP compared to a decent size normal filter element. Joe Sherman has made similar findings on Speed Torque.