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I recently spoke with a noted tuner who is prepping my car for an SCCA "stock" catagory.

We were talking about allowed changes to the exhaust system and he related 3 interesing facts to me

1. Some SCCA rules allow "Cat Back" mods however the definition of "Cat Back" varies. Ie. some regard it as immediately behind the Cats where others (the Feds) regard it as the flange just before the over axle tube. I will be inquiring with the SCCA on this.

2. I asked about an after market cross over/ balance pipe and he said they really don't make much difference Horsepower wise over the stock "H" pipe if the stock one is properly massaged. "How so?" I asked.

3. And this was the most startteling thing to me! He said that not all stock "H" pipes are alike. That it is not really an open pipe as one would suspect from the outside and that there is a baffle inside of varying sizes from car to car. Some as small as 1/2"!!!

4. My next question is is this a manufacturing defect or is each "H" pipe tuned to a specific car/engine/exhaust system?

5. Can performance gains be had by reaming out the baffle? The tuner said YES BTW and much cheaper than cutting of the pipes behind the CATS and welding on the aftermarket crossover/balance pipe.

6. Anyone else know of this "H" Pipe Conspiracy?
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