Turbo Manifold Mockup Kit 1.25" NPS SCH10S (42.2mm OD) – 136pc BUILDER

Turbo manifold and header mockup blocks for 1.25" NPS schedule 10 pipe

Our standard shop kit. 136 magnetic mockup blocks in 1.25" NPS SCH10S (42.2mm OD), enough to model a four or six cylinder turbo manifold with room to try more than one routing before you settle on it. The extra volume over the STARTER kit is what lets you build two versions side by side and pick the better one, rather than dismantling a good design to test an idea.

What it does

• Model four and six cylinder manifolds and headers in full, with blocks spare for alternatives
• Trial competing primary routes without breaking down the first attempt
• Balance equal length primaries by block count
• Model the merge collector and confirm the collector angle before you cut
• Confirm turbo, wastegate and downpipe clearance before any pipe is cut
• Generate an accurate cut list and material order

Kit contents (136 pcs)

• 12 × 30° 1D
• 12 × 30° 1.5D
• 12 × 45° 1D
• 12 × 45° 1.5D
• 12 × 90° 1D
• 12 × 90° 1.5D
• 25 × 15 mm straight
• 12 × 25 mm straight
• 6 × 50 mm straight
• 4 × 75 mm straight
• 4 × 100 mm straight
• 6 × Flexible Flange Adapters
• 5 × Flat Pipe Measuring Gauges
• 1 × Pipe Guide
• 1 × Heavy Duty Plastic Carry Case

Pipe compatibility

Matched to 1.25" NPS schedule 10S stainless pipe, 42.2mm outside diameter. Note that pipe is sized by nominal bore, not outside diameter. 1.25" NPS pipe is not the same as 1.25" OD mandrel bent tube, and the two are not interchangeable.

Header and manifold mockup, step by step

1. Mount the flange adapters to your head flange or turbo flange
2. Snap bends and straights together, rotating each joint to clear obstructions
3. Adjust until every primary is routed and the lengths are balanced
4. Count your blocks for the cut list, then cut, tack and TIG weld to match

Specification

Made to order in Britain

Every kit is produced to order in our own workshop rather than pulled off a shelf. That is why we can supply centreline radii and pipe sizes the imported kits do not offer. Need a size that is not listed? Get in touch and we will quote it.

FAQs

Can I use this to design an exhaust header?
Yes, provided you are building in pipe rather than tube. These blocks match 1.25" NPS schedule 10 pipe, which is standard material for turbo manifolds and many naturally aspirated header builds. Mandrel bent tube sized by outside diameter needs different blocks.

BUILDER or STARTER?
STARTER covers a single four cylinder manifold. BUILDER gives you enough blocks for six cylinder work, or for trying two routings on a four cylinder without dismantling the first.

BUILDER or WORKSHOP?
BUILDER suits most one man shops. WORKSHOP adds enough volume for V8 header work and for keeping several projects mocked up at once.

Can I add to this kit later?
Yes. Straights and 30, 45 and 90 degree bends are all sold as add-on packs in this same 1.25" NPS SCH10S size, so you can top up whichever angle you run short on.

Can I mix 1D and 1.5D bends in one manifold?
Yes, and most builds do. Tight 1D bends get you round obstructions, 1.5D bends flow better on the open sections. Both radii are included in equal quantity.