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1. different fin design...said to be slightly better (dont know how true)
2. I think some cutting needs to be done to the turbo to IC pipe.
I have a old model and it works perfectly fine, in fact it's actually a Kevin Wyum ASP model before M2 started carrying them...Brian once asked me to trade him for a new m2 large IC. Read into that what you will
get some flexible exhaust piping from an autoparts store and make it yourself. . . then take that "master" to a muffler shop and have them make another replica. . . unless they can tell you the bends that you need to have it made elsewhere out of aluminum. once you can get the total measurements you can call up burns stainless and they will make it for you and ship it to your door. just make sure its right. . . SO, your best be is to have the muffler shop make another replica, test fit it, have everything measured (if it fits) and call in the order. . . voila. . . custom ic pipes.
new project = my brand new son. . . wonder if i can convert him to single turbo????
The best way to make the y-pipe work with the M2 is to remove the top section of the y-pipe, take out the 2 studs, and have a machine ship grind the ends off where the studs were until it is nice and round. Be sure to leave a lip though and then get a 2.75" (70mm) I.D. 90 degree silicon coupler to slip over it. Saw the 90 degree bend off the M2 pipe and it will slide right into the elbow. This makes for a clean install and you don't have to worry about the pipe hitting your strut tower brace. I recommend a elbow from SAMCO which you can get through BRITS.
The *new* core is more efficient in that the rows are smaller and there are more of them. They also supposedley redesigned the pipe from the IC to the throttle body.
The issue is that y pipe outlet snakes around to the right of the smog pump to align with the inlet of the stock intercooler.
The m2 inlet is about 6 inches to the left of stock. So you either have to make a hose/pipe snake back over to hook up with the new inlet or modify/cut back the y pipe so you can run a hose straight down.
Pettit has 2 pipes for the intercooler designed to work with the factory y pipe. one comes straight forward from the factory y pipe...if you take out the smog pump. And one curves around the smog pump.
Personally, I wouldnt get the effini if you plan to get a large smic. The idea is to eliminate restriction and bends in the system. The effini flows, the intercooler flows, but the bends in all the hoses dont flow as well. By eliminating the smog pump and installing the straight shot intercooler intake pipe, I would guess you would get similar flow as with a effini and twisty hoses...maybe even better.
My set up flows like a biotch...spool is much much faster.
I will post pics on my install later.
FWIW koyos with large smics make install issues.
Pluralitas non est ponenda sine neccesitate