True vs. Fake 3" Exhausts 


Our down pipes are made with the Apex cat-back systems in mind. People are always asking us for a 3" DP that will  bolt up to other company's exhaust systems. This is what we don't. If a flange will bolt up to the stock cat, then there is not room for a 3" pipe to fit between the two bolts in the flange. The exhaust must neck down to 2 1/2" to fit between the bolts at the stock catalytic converter. Even then, many companies go even smaller right there. Some are as small as 2" inside diameter. To install a 3" DP and or cat, they need to have the offending small pipes and flanges cut off at additional expense so that a 3" pipe can be used. Otherwise you are just wasting the 3" DP only to have it neck back down to 2 1/2" or less.

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One company's idea of a 3" "High Flow" exhaust for the AWD Eclipse. This is the flange (2" inside diameter, smaller than the stock cat outlet) that bolts to the stock cat. 

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HK$'s idea of a big exhaust. Starts off pinched to 2 1/4" to a 2 1/2" pipe and resonator.

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After the resonator it expands to 3"

The reason these parts are on the floor and all cut up is because they were removed to make a real 3" exhaust system.

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The old RSR and the current Apex systems use an adapter that can be removed to allow a 3" DP and or 3" cat to be installed easily and with out cutting and welding.

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Our 2G  DP starts out at 2 1/2" to match a ported O2 sensor housing. It bolts directly to the RSR or Apex exhausts once the adapter is removed.

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This expands to 3" right after the flex section. 

It can be bought with no cat or with a 3" higher flowing cat. Also the option to switch back and forth with a test pipe at the track for racing.


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Contact Road///Race Engineering
13022 La Dana Ct, Santa Fe Springs Ca. 90670
Phone (562) 777-1522  Fax (562) 777-1562
Last Updated 4/04