So im in the process of purchasing one of the two in the very near future. Ive done research as to what the difference is between the 2. My question that i cant seem to find the answer to is if u run the D head at the lowest boost levels ... #10... what will the horsepower be? reasons i care.. for the time being im gunna run with a stock block and i dont wanna blown stuff up.. pple always say if ur around 450 or less to the wheels you shouldnt run into problems.. this being said would the D head at #10 be under 450 rwhp? my only support mods are slp longtubes catted x and lm1 catback

 

well I was in your exact situation a year ago, and installed my D1 head unit with the 8-9 lb pulley. Only other mods were the same SLP longtubs, catted X, magnapacks, and intake spacer.... and the beast made 493 rwhp haha. that was with a very conservative 11.5ish A/F on the tune. Knowing that wouldn't have lasted long I got the motor built before it blew.

I would say if you are honestly content with 400-450 rwhp and keeping the stock block go with the P1- they make more then enough power for the stock bottom end. BUT if you know deep down inside that you'll want more in the future, and a potential motor build is ahead- go with the D1...the thing can make some pretty crazy boost. my .02

 

+1 to the TR mach man right there!!!

 

Damn thats alot. Thats just it i dont know what i have planned for the future.. i never thought id put a blower on my car and here i am lol.. i might just get the P head. if u were putting 12# outta the p head what kinda numbers could u expect? i guess im looking for around 450rwhp

 

I'm running with a D1 on a conservative tune at 13lbs. It's possible but pushing it, they'll just throw the timing to make it safe for ya.

 

I'd get a D1 simply because the p1 headunits seem like POS with as many people as there are having to replace the seals all the time.

 

Ya, they do seem to leak some. I had to replace my inner seal. This winter i'm replacing everything.

If you do run into some problems Sace, i bought used, great guy over at superchargerrebuild.com will help you out a lot.

 

My D1 Pulley shaft was leaking horribly when I put it on.... actually flung oil all over the place. You can get that seal from your local napa- part number #11625. It was like 6 bucks lol. If you can change a pulley you can change the seal. Now the internal seals are a little harder....

 

Yeah im 90% gunna go with the P1 unit. So from the last few posts is seals going on these units something i should expect?

 

Nah, not if you buy new you shouldn't. But if it does goes its probably the seal Machwon was talking about which was an easy fix.