BTR Trinity Tunnel Ram: One Base, Every Build

Car Junkie April 6, 2026 9 min read 0

12

Brian Tooley Racing built a reputation on pushing the LS and LT platforms further than most shops thought practical. The Trinity runner system is a big part of that story. It gave builders a modular induction platform with real depth. You could spec runners, lids, and fuel rails to match your exact combo instead of settling for whatever a shelf intake happened to offer. Now BTR is expanding that system again with the BTR Trinity Tunnel Ram base, and the additions are worth understanding before you spec your next build.

The TNL is a lower plenum unit that opens three new doors: added plenum volume, compatibility with Holley Hi-Ram style lids, and a foundation for air-to-water intercooling. We went straight to BTR Marketing Manager Brian Havins with the questions builders are actually asking. Here is what you need to know.

What Is The BTR Trinity Tunnel Ram Base?

The TNL sits between your Trinity runners and the upper lid. It carries 350 cubic inches of plenum volume, accounting for runner protrusion, and uses a 12-bolt Hi-Ram style mounting boss on top. That bolt pattern opens the TNL to a wide range of Hi-Ram style lids, lid spacers, and intercooled uppers. Direct compatibility with the Holley Hi-Ram is confirmed. The base is available in black or natural finish. BTR designed, cast, and machines it entirely in the USA.

The concept is flexibility. Builders who have invested in a Hi-Ram style upper do not have to walk away from that hardware to get into the Trinity system. Builders who want air-to-water intercooling now have a dedicated platform. And builders who want more plenum volume have that option too, though Havins was careful to frame what that actually means in practice.

BTR Trinity Tunnel Ram Runner Compatibility

This is usually the first question, and the answer is broad. Havins confirmed the TNL accepts all current GM and Ford Trinity runners with one exception. “Yes, except for the dual-fuel LS3 runners, which are not yet released,” he told us. “The HEMI has its own TNL, but that is the only difference.”

That covers a lot of ground. LS Cathedral port and LS3 port Short Runners are confirmed fits. LT builders have Short, Mid, and Long runner options covered, with or without port injection. The Godzilla runners fit as well. HEMI is coming on the separate TRP-TNL-H and TRP-TNL-H-BLK versions.

BTR published a detailed fitment chart that maps runner model, plenum compatibility, and fuel rail fitment across the full lineup. It covers TR-1, TR-3-V2, TR-3-2i, TR-7-V2, TR-7-2i, TR-GenV, TR-GenV-V2, mid-length and long-length GenV injection variants, both Godzilla injection runners, the TR-3-DF dual-fuel setup, and all current HEMI runner options. Every combination is listed with fit status and the correct fuel rail for that pairing. Pull that chart before you finalize your selection.

Can You Run Your Existing Hi-Ram Lid On The BTR Trinity Tunnel Ram?

Yes, and for a lot of builders, this is the most useful feature on the whole base. Havins confirmed it is a direct swap. “It would be a direct swap for anyone who currently has a combo that is running a Hi-Ram style lid,” he said. “So even guys on a Lo-Ram setup can transfer their combo to our TNL.”

The one exception is the Ultra Low Ram. That setup uses a front-entry design outside the standard Hi-Ram bolt pattern. If you are on a standard Hi-Ram or Lo-Ram upper, the TNL accepts it without adapter plates. If you spent money on a quality upper, you are not starting over.

That compatibility also works the other direction. Builders new to the Trinity system who want to run a Holley Hi-Ram upper or any other 12-bolt compatible lid now have a BTR lower to put it on.

Air-To-Water Intercooler Setup On The BTR Trinity Tunnel Ram

The TNL accepts an air-to-water intercooler brick between the base and the upper lid. Havins was direct about the tradeoffs here.

Hood clearance was not a design target. “Hood clearance was not a consideration,” he told us. “Rather, the gaudier the better was the consensus of the design team.” The flange height came from extending the runner mounting plane to meet the width of the legacy Holley Hi-Ram flange. BTR published a height chart covering every runner and lid combination. That is the document you need before you start planning sheetmetal work.

On the brick itself, BTR has not tested or formally recommended a specific core. “There is no specific intercooler brick we have tested or recommend,” Havins said. “The hose sizing is specific to the brick.” Adding a brick eliminates stock hood clearance in virtually every application. Plan for a hood modification or a cowl setup.

Does Plenum Volume Affect The Power Band?

We asked Havins to give us the straight answer on what the TNL’s 350 cubic inches does to the power curve compared to the standard Trinity plenum.

“The difference in plenum volume has been a topic of debate, and we do not see a definitive advantage or disadvantage in a direct comparison with our standard Trinity plenums at the N/A power levels we’ve tested,” Havins said. “The additional volume is a by-product of the ‘V’ configuration and serves the larger design intent of adapting an intercooler brick.”

The volume is there because the geometry requires it. For naturally aspirated builds, do not buy the BTR Trinity Tunnel Ram expecting a power band shift from plenum volume alone. For boosted builds where the intercooler brick is the point, the plenum volume question is secondary to the thermal management the brick provides.

Installed Height And Hood Clearance Planning

The TNL was not designed with hood clearance as a constraint. BTR extended the runner mounting plane to meet the Holley Hi-Ram flange width. Installed height is a function of that geometry.

BTR addressed this with a full height chart covering every runner and lid combination. That chart is your planning tool for any specific chassis. If you are dropping this into a truck swap, a G-body, or anything with a tight engine bay, pull the height chart first. Measure your available clearance. Then decide on your lid and runner combination. BTR has options for tight-fitting situations on their end as well.

Who Should Run The BTR Trinity Tunnel Ram?

The TNL makes the most sense in three situations. Any boosted build where air-to-water intercooling is part of the plan. Any builder already on a Hi-Ram style upper who wants Trinity runners underneath without giving up their lid. And builders who want access to the full range of 12-bolt compatible lids and spacers with BTR runners underneath them.

For a naturally aspirated street build where hood clearance matters and intercooling is not in the plan, the standard Trinity plenum is the cleaner path. The BTR Trinity Tunnel Ram is built for the builder who is ready to go further.

For more on what the Gen V platform can handle under boost, check out our Project Danny LVito feature, where Scoggin Dickey pushed a stock LV3 4.3-liter V6 past 1,000 horsepower on the engine dyno.

Frequently Asked Questions