Band clamp: lap-joint or butt-joint??

Ok im geting my Kooks LT and the stainless steel off road y-pipe this week and i ve bought everything i need for the install:

-felpro-1406 gasket
-24 inch O2 Sensor extension(2)
-Poly motor mount(left and right)
-1" Arp stainless steel headers bolts
-Aluminized insulation tape

The only thing missing are the clamps.The headers are slip fit so i would need 2 clamps to bolts each collector to the y-pipe.Also the y-pipe is in 2 pieces so its also connected slip fit type so i would need another clamp there.Finally the y-pipe will connect to my magnaflow cat back so another one there.

So i need a minimum of 4 clamp and i will not use ****ty standard u-bolt clamps style on these beautiful headers.I will use band clamps in 3" diameter since my collector,y-pipe and cat back are that size.

Since everything is slip fit do i only need to order band clamp lap-joint style
http://store.summitracing.com/partdetail.asp?autofilter=1&part=WLK%2D33272&N=700+4294919985+4294903626+400358+4294784226+115&autoview=sku

or i will need butt-joint style too?
http://store.summitracing.com/partdetail.asp?autofilter=1&part=WLK%2D33278&N=700+4294919985+4294903626+400358+4294784226+115&autoview=sku

Thanks
Eric

i'm pretty sure you will need the lap joint

Either will work. The butt joint will pull down and make a crease in them,but they have to be really tight.All a 1/2" drive impact will pull.
The lap joint is less hassle.

If you ordered the Kooks Y pipe then they will probably include the band clamps. Mine came with a set. :)

Thanks , i will order 4 lap-joint and maybe 2 butt-joint just in case ;)

97WS6SCharged: When i ask the vendor about the band clamp they told me that they where not included with either the headers or the y-pipe:(