ive been looking for these as i like the look much more then slps runners
anyone know who makes them the website i found the pics on say there slps
but no set of runners ive seen uses the 2 long bolts like these do

i know they where on the prototype 25th anny cars

if no one makes them can anyone custom make them?

Edit: There are two custom sets like those made by member JerryWho. There were two very similiar sets made. They are now residing on Dyno Don and Kevin91Z's cars. Both are upgrading their motors and the results should be out sometime after the 1st of the year.

It takes alot of work to customize the runners like that. If you had to pay someone I would hate to estimate the cost. A better solution for most might be to find a set of the first generation SLP runners and go from there. One side of the paired runners is already siamesed. Maybe just siamese the other side and let it go at that.

i dont care for the way the slps are seperated on the top thats what i liked about these

they look like they would increase plenum size on the top almost like a superram but not as ugly lol

That is true and that is exactly what they do along with the shorter runners that make power at higher rpms. Don's and Kevin's are 12 second cars. With the latest mods I suspect they will be in the low 12's. Stay tuned.

I have attached a picture of a 3rd set of runners on another car that are very similiar. Again a custom set.

they where made after a secret design that GM never put out...sum how he got the designs lol. basically its wats stated above. the cast aluminum SLP's are opened and ported completely then they weld in aluminum and make it look flush. again this acts like a larger plenum but at a cost that would say.... is it worth it? also the difficulty of welding cast aluminum. personally why not just get a set of stockers, cut the inter tubes in half and half cut the outer tubes then get a tig welder to weld in aluminum thin gauge sheet stock and come up with the same idea... it would prob cost less, easier to work wit, lighter, and would have that sexy fabricated look to it. thats what TPIS did to there siamesed runners, but u could create larger plenum area by following the design above.