how hard is it to cut that 4.5 hole in the truck and what do i use to cut it with can i use a plasma cutter and dose it make that much difference

 

[quote author=ox link=board=7;threadid=9345;start=0#89557 date=1041984703]<br> can i use a plasma cutter and dose it make that much difference<br>[/quote]<br><br> Plasma Cutter!?!? Get you a holesaw from your local hardware store!

 

A normal bi-metal hole saw will cut the hole and arbor will cut the hole with ease...I would not use a plasma cutter because of the painted surface your working on.<br><br>The hole will make a difference in intake charge temps and lower EGTs more...I dont have empirical numbers though<br><br>Don~

 

[quote author=ox link=board=7;threadid=9345;start=0#89557 date=1041984703]<br>how hard is it to cut that 4.5 hole in the truck and what do i use to cut it with can i use a plasma cutter and dose it make that much difference<br>[/quote]<br><br>As others have suggested, I'd stick with the hole saw ;D<br><br>As for numbers, it will depend on how heavily modified your truck is. On a stock or lightly modified truck (EZ, 275s) the cowl hole doesn't make a huge difference. Maybe about 50F difference at WOT between Hush and dual inlet mode. As you increase HP, the gap begins to widen to the point where we've seen an _extra_ 200F reduction (above the 200F reduction in Hush mode) at WOT with the dual inlets.<br><br>Rod

 

<br><br>200F <br><br>That could literally mean the life of your Cummins!<br><br>Don't tell Scotty, his head is big enough already!

 

[quote author=SFtopSGT link=board=7;threadid=9345;start=0#89612 date=1041992337]<br>[/quote]<br><br>Somebody shoulda told Greg (Cummnzpwr) that about 2 &amp; 1/2 months ago!

 

I think the plasma cutter would work great for that hole if you have one.<br><br>Hey it only sounds harsh, but the plasma cutter would do a better job on the metal with all the folds in the panel. If you are a good hand with the plasma cutter, go for it IMHO...<br><br><br>J-eh