Your new piping should be setup in a manner that will allow you to hookup your BOV without problems.

I am having trouble understanding your question but if you are asking if you can install your greddy BOV in with your existing setup (stock piping and side mount), the answer is yes as long as you connect the recirculation tube. You could get away without using the recirc but you will have some ill effects such as running rich in-between shifts.

Once you install your front mount w/ maf-t however, this is a different story. You can install the GM MAF AFTER your BOV then you would be able to vent it to atmosphere and get that cool sound which is probably why you bought it in the 1st place

ok since I'm in need for reputation points and the info will be useful to you i'll spend the time to give you a brief overview of why you must recirc your bov with your stock setup.

Our cars use a maf setup, this means that the sensor counts the air coming into your engine and the ecu uses this "count" to determine its position on the fuel map(it actually doesn't count the air persay, but going into that would take up atleast a page). So the more air the maf counts the more fuel its going to add to the mix...ok so how does the bov affect this...well after the air is counted its compressed by your turbo and stuffed into the combustion chamber, key word here being stuffed. So when you let off the gas or want to slow down you still have the amount of air between the turbo and your throttle body thats all stuffed together and has nowhere to go...so your bov gives that air somewhere to go, in the stock setup it routes it back before the turbo, but after the maf...the reason is that the maf has already counted that air and your ecu is expecting that air to show up in the combustion chamber at some point...if you simply "throw it away" (also called venting to atmosphere) you'll end up with an over rich fuel mixture, b/c your ecu is still going to dump the original amount of fuel it calculated from the maf count even though you just threw some of it away...think of it like a box of mac and cheese...the box comes with the correct amount of cheese based on the number of noodles its expecting to be mixed with...now lets say that when you dump them into the pot you miss and 25% of those noodles have to be thrown away...what happens when you mix in the cheese? well they taste way too rich, because instead of the correct mixture you now have more parts cheese then originally calculated.

Ok now you're probably asking so how to people vent to atmosphere then without issues? Well there are a few ways, but it all boils down to taking the reading at the closest source possible to the combustion area..Option A. run a map or speed density setup...these rely directly on manifold pressure/air density and could care less what happens to the air before that...since they read from the intake manifold(in 99% of the setups), they know that other than a hole in your block or manifold there is nowhere for the air to go after it passes the sensor...so since the bov is on the intake piping it doesnt care where that air goes since it only keeps track of the air that actually makes it past the throttle body...Option B. is putting the maf on the pressure side(aka blow thru maf, most commonly a gm). what this does is eliminate the bov quandry by only counting air after its past the bov chamber..once again once it passes this setup there isnt really anywhere the air can detour to other than some major failure. Ok thats basically it in a nut shell...I won't even go into the venting vs. recirc discussion or the map vs. maf arguement...you can look into these on your own as both side of each have good points..

Very Well Said, I like the Mac and Chee Example