Y pipe build size
02-26-2007, 08:41 PM
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Y pipe build size Putting on a set of QTPs and gona hve my y pipe cutom built with high flow cats and flowmaster y collector. Should I have my y pipe built 2.5 inch or 3 inch
02-26-2007, 09:05 PM
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Originally Posted by NHRAMAN
Go 2.5..it is all u need + if u lower your car you will be happy you did...
02-27-2007, 06:08 PM
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NO LOWERING.....I agree then..... go 3" .mines 3" and speedbumps are troublesome to say the least.
Last edited by NHRAMAN; 02-28-2007 at 03:47 PM.
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02-28-2007, 09:14 AM
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2.5" inch collector is what will hold back the flow. With the Long Tubes you would be better off with a 3" or even a 3" x 3" ---> 3.5" collector. That would be best. Then 3.5" back to your catback. If going custom, they should be able to tuck it up there nicely, such that it won't hang low. With a ypipe your collector will be the biggest limiting factor in flow.
02-28-2007, 12:33 PM
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Thanks for all the info... I will be building it with those magna flow spun cats, (still trying to figure out which style) fowmaster collecters, and flowmaster merge. 3 inch it is!
02-28-2007, 03:02 PM
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Originally Posted by lsx24
2.5" inch collector is what will hold back the flow. With the Long Tubes you would be better off with a 3" or even a 3" x 3" ---> 3.5" collector. That would be best. Then 3.5" back to your catback. If going custom, they should be able to tuck it up there nicely, such that it won't hang low. With a ypipe your collector will be the biggest limiting factor in flow.
Get the longer one or the shorter one?
02-28-2007, 03:32 PM
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Originally Posted by CAMJAG
On Flowmaster's web site they have the Y collector in 3 X 3.5 X 17.5 AND 3 X 3.5 X 18.5
Get the longer one or the shorter one?
Get the longer one or the shorter one?
02-28-2007, 03:38 PM
#18
I think you should do a 3" x 4" Flowmaster merge with a 4" x 3" reducer, since you'll have to have one anyway. This is what QTP uses on their stuff, and works great for power. It also lets you hack the reducer one day and have a 4" system like mine. 
02-28-2007, 05:42 PM
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Ok so how does this look for the y pipe build? Should have everything here besides the mandrel bends, and the clamps. Let me know if I am going 100% in the right direction
Flowmaster Y collector 3 x 4 x17.5
Flowmaster 3 inch to 3 inch ball flange kit (2 pairs)
Flowmaster reducer (Wrong size though) 3 inch to 4 inch
Magnaflow universal 59959 3 inch center spun mettalic cat
Flowmaster Y collector 3 x 4 x17.5
Flowmaster 3 inch to 3 inch ball flange kit (2 pairs)
Flowmaster reducer (Wrong size though) 3 inch to 4 inch
Magnaflow universal 59959 3 inch center spun mettalic cat
Last edited by CAMJAG; 02-28-2007 at 06:13 PM.
