Full Exhaust Overhall.

[Beer Baron]

just looked at the ebay one, it could be 4 inch. don't think it's trust though as I've never seen them with that type of round 5 bolt flange before. and most of the trust front pipes are the mx which are mild steel anyway. so it could be modified, or most likely is another brand all together.

[Nee-san]

He got back to me and confirmed the dimensions so I think you and Ash may be right Baron.

well see when they arrive I guess !

[Overnight Parts From Japan]

Bigger the better mate, try to avoid merges and changes up/down in size to increase flow. I would be thinking 4 inch the whole way, as some of the other guys have said

[R31Nismoid]

just looked at the ebay one, it could be 4 inch. don't think it's trust though as I've never seen them with that type of round 5 bolt flange before. and most of the trust front pipes are the mx which are mild steel anyway. so it could be modified, or most likely is another brand all together.

Mine we certainly stainless, they went "off" as stainless does with heat.

But you are indeed right about 5 bolt, thats very odd.

Most 3.5-4" flanges I've seen are all 3 bolt, where 3" are 2

[Nee-san]

Yeah it is a very strange flange, the guy selling it assures me it is 3" into 4" and I will be sending it back if it isn't

I have settled on this behind Midori dumps, (76mm).

into 4" inlet with 5" body, then a 4" pipe all the way to the back.

Anyone with objections, speak now or forever hold your peace !

[Piggaz]

Put up some pictures of the dumps... I'm waiting for a set to come from japland!

[Nee-san]

Put up some pictures of the dumps... I'm waiting for a set to come from japland!

I haven't ordered mine yet !

I dare say yours will arrive first, so post some pics when they arrive

[tk80]

what's the limit of the hks dumps?

i have hks dumps into unknown front pipes (2x70mm from memory) into a 3.5" all the way through (no cat).

surely that's good for 400rwkw?

[Nee-san]

As far as a limit is concerned I'm not to sure, however being HKS they can't be that bad of a thing.

the issue is really that most split dump designs do not take advantage of their main design benefit over the bell-mouth type.

This being that the separated wastegate flow (via the split) is often reestablished a short distance downstream of the exducer which for one creates some of the turbulence you are attempting to avoid in the first place and two often creates a less then fantastic path for the exhaust gases to flow through given that there is often a pretty substantial angle where the split is reintroduced to the flow stream.

[Piggaz]

I have made over 400 rwkw on hks dumps, hks fronts and a 80-90 mm kakimoto catback. It can be done...