Check out this tubular manifold and let me know what you think...

[Verticaljump1]

This is the manifold I bought for my T4 turbo set-up. It's a custom job, the welds are a little messy. I think I'm gonna take them to the shop and have the welds in the divider smoothed out and reinforced with some outside tigging. And I'm going to gasketmatch the t4 flange (a little material is in the way on the corners). Overall I'm happy with the manifold, but I'm no expert so I wanted some thoughts and advice. The wastegate flange is a 38mm by the way.

 

[kicker91laser]

It doesn't look too bad on the outside, but I would definately smooth out the collector area on the inside, looks like they used some thick walled mild steel tubing to make it.

 

[GSX_RCR]

The #1 runner looks to be about 2-3 times as long as the others!

Looks solid though.

 

[qtxdevilz]

if you do not mind me asking...where did you get it from and how much did you pay...thanks...

 

[Verticaljump1]

I got the manifold, v-band downpipe, and 4G64 shortblock (stock) for $600 picked up. The guy fabricated a lot of stuff but I don't think he made the manifold. He does have some really nice intake manifolds and o2 housings that he's built. I told him I'd look him up for my 3.5" cat-back. Any other comments on the manifold? Is the #1 runner being the longest gonna hurt anything?

 

[alex99gst]

Nothing that I could think of other than issues with the turbulance. I know DNP makes their manifolds with all equal lenght runners.

 

[dalatinromeo]

I know DNP makes their manifolds with all equal lenght runners.

Yup, equal length runners are the best

 

[Verticaljump1]

I don't need the best, just better than cast.

 

[UMR98GSX]

As far as being better than cast, yes that manifold should outflow a stock or mildly ported cast manifold. The runners are usually equal length to help match exhaust pulses and to prevent turbulence (reminds me I need to get back to studying for my fluids final) since most cast manifolds have a ridge in the collector to direct the gasses more towards the tongue of the turbine housing.

It looks like it is sturdy enough to hold up a heavy turbo without straining too much too!

Definitely clean up the welds in the collector.

 

[UMR98GSX]

Upon a second look (and my brain catching up with me) I realized that the flange on the collector looks like a mitsu with an imprint from a T4 gasket around it. Since you can really see the corners of the old T4 gasket, that means that there is untapped flow capability where the collector meets the turbine housing. If I were you I might have the machinist that is going to be doing the reinforcing welding and porting to remove that flange in favor of a T4 flange to improve flow. Make sure it is made of the same material as the manifold to help prevent cracking when everything heats up and expands.