this will work fine if your not running a cat-if so it will stop it up like crazy. At least with suction coming of intake it gets burned. But do not do this if you have a cat. edit- this is talking about the moroso scavenging kit. I was able to fix my blow by problem just replacing a lot of clogged vaccum lines. I tried to go to a larger size on the vac lines I replaced too.
1988 red 4 door XJ 4.0, AW4 Command-Trac
3" Skyjacker Softride with AAL and Nitro Shocks
30x9.5 ProComp All-Terrains
Hella H-3 100watt bulbs in factory fogs(upgraded wire)
50x4 Pioneer Head Unit and
Pioneer 5.25" rear and Infinity Kappa 4" front
10" Infinity BassLink; Cobra CB
4' Firestik II (USA limited)
Dana 30 front, Dana 35 rear, NP231
next mods are lockright front, SYE conversion, and BB!