2-into-1 Exhaust Systems for Circle Track Race Cars
The Ultimate Exhaust System for Your Race Car
Let’s face it: Exhaust systems are a drag to install on a race car. For this reason, most racers take the easy way out and simply hang a couple of pipes on the manifolds. This is the worst way to run an exhaust system with cast iron manifold!
Installing an exhaust system where the two exhaust pipes run into our 2-into-1 collector will produce more power and make it quieter than dual pipe systems.
This original Brzezinski Racing Products design routes the exhaust pipes from each side of the engine into one common collector. With this design we are tricking the engine into thinking it is firing every 90 degrees as opposed to the random firing of dual outlet systems.
2-into-1 systems have a dramatic effect on power from 3500 to 7000 rpm.
The most important fact to remember when building your system is that the primary pipes need not be routed in any particular way to gain the added horsepower of the 2-into-1 effect. Installing the system over the top is only one way the system can be routed.
While “over the top” installation is generally easier, a system underneath the car will achieve the same power figures. The engine doesn’t care how the exhaust pipes are routed.
However, NOT running your two exhaust pipes into one of our collectors will cost you 10 to 25 horsepower!
Center Dimensions for the "over the top" 2-into-1 System. |
Corvette Manifold 2-into-1 Dyno Test
As you can see in the dyno test results in the dyno chart at right, there is a 29 hp gain at 5000 rpm with the addition of a 2-into-1 System.  |
Left Side Dimensions consist of three 90 degree pipes and one 45 degree pipe leading into the collector. |
Right Side Dimensions consist of four 90 degree pipes leading into the collector. |
2-into-1 Exhaust System Kits
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- Quieter than dual systems
- 10 to 25 more horsepower than dual pipes
- Can be constructed over the top or under the car
- If you need additional pipes, we have them in stock
- Any unused pipes from the 2-into-1 kits can be returned for full credit.
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| Part# |
2-into-1 Exhaust Systems for Corvette Exhaust Manifolds |
Price |
| 171A-3.5 |
2 1/2" Exhaust System Kit for 2 1/2" outlet Corvette Manifolds. Includes: (1)#164A kit, (1)#169B Collector, (5)#167A 90° pipes, (1)#168A 45° pipe & (1)12" section of 2 1/2" straight pipe. |
389.00 |
| 171-3.5 |
3" Exhaust System Kit for 2 1/2" outlet Corvette manifolds. Includes: (1)#164S Pipe Kit, (1)#169 3 1/2" outlet Collector, (1)#168 45° pipe, (5) #167 90° pipes & (1)12" section of 3" straight pipe.
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389.00 |
| 171-4 |
Same as #171-3.5 except with #170-4" outlet Collector. For use on 4 barrel engines or 350 and larger 2 barrel engines running modified manifolds.
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389.00 |
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2-into-1 Exhaust Systems for "Log" Exhaust Manifolds |
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| 171A-3.5-193 |
2 1/2" Exhaust System Kit for Log Manifolds. Includes:
(1)#193 pipe kit
(1)#169B Collector
(5)#167A 90° pipes
(1)#168A 45° pipe
(1) 12" sections of 2 1/2" straight pipe.
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389.00 |
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2-into-1 Exhaust Systems for "Chevy II" Exhaust Manifolds |
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| 171A-3.5-166 |
2 1/2" Exhaust System Kit for Chevy II Manifolds. Includes:
(1)#166A pipe kit
(1)#169B Collector
(5)#167A 90° pipes
(1)#168A 45° pipe
(1)12" section of 2 1/2" straight pipe.
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389.00 |
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Any unused exhaust pipes you have left over from the 2-into-1 kits can be returned for a full credit. |
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2-into-1 Collector
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 The key component of the 2-into-1 System
We have run countless dyno tests on 2-into-1 versus dual pipe systems. Whenever the primary pipes are routed into one of our collectors, 10 to 25 housepower is gained. |
| Part # |
Description |
Price |
| 169 |
Collector, 3" inlets and 3 1/2" outlet for 2 barrel engines. |
$110.00 |
| 169B |
Collector, 2 1/2" inlets and 3 1/2" outlet. |
110.00 |
| 170 |
Collector, 3" inlets and 4" outlet for 355 and larger 2 barrel engines running good manifolds or 4 barrel engines. |
110.00 |
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Tips for Building your 2-into-1 System . . .
- Optimum Primary Pipe Length — Keep the primary pipes as short as possible. Systems are designed around individual 90° and 45° bends, which are 12" long. Do not use more than 72" of pipe on each side. This translates into a maximum of 6 pipes per side. Three horsepower will be lost for each additional 12" section beyond 72". These recommendations are based on dyno tests with stock and modified Corvette, Chevy II and Log manifolds.
- Unequal Length Primary Pipes are OK — Our dyno tests have concluded that variations in primary length have no adverse effect on power when a collector is used. Primary pipes which are equal in length, or as close as possible, are preferred, but in some applications this is just not possible. So, if your pipes going into the collector are not equal, don’t worry.
- Pipe Length for Dual Pipe System — If you are restricted to a dual pipe system, pipes should be 45" to 55" in length, equal on each side, and run a balance tube the same diameter as the exhaust pipe.
- Secondary Pipe Length — Run a minimum of 12" of secondary pipe after the collector. Adding more length has little effect on power. In other words, “We’ve run 1 to 6 feet of secondary pipe and noticed absolutely no power difference.”
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