W did this test a while back but it took a while because we were only able to get the raw data files from Church Auto Testing to publish. I needed to put them in excel and normalize all the data. It was a lot more involved than I expected but I didn't want someone calling us out for not having the graphs cross at the right place, etc. The numbers have not been fiddled with at all. If anyone wants the csvs shoot me an email.
The test car was a boosted TL-S with a Flashpro and a high boost pulley. It was an automatic as well. If gains and losses are viewed as percentages we feel the relative graph data above will be indicative of what we would see on an NA J-series.
AFR and IAT were both monitored closely for consistency. No pipes required retuing to get these numbers, and tuning would not have needed noticeable differences (we played with it...it would not have). But the tune in the car was optimized when we got to it having just been dialed in on the same dyno the day before.
All tests done on the same day, same car, same dyno, same procedure:
3 pulls to heat up engine, then rest for 5 minutes, then one pull to be the one to use for the test. In all cases the "1 pull" was about on average with the rest of the pre-runs. We feel this data is all repeatable and reliable when done under the same conditions.
Full disclosure, at the time of testing and posting, ATLP is produced by Heeltoe. If anyone wants to call Church Testing to validate the test, feel free. Again, the raw data is available for whoever wants it.
Our take-aways:
In other news, the ATLP options were easier to install. RV6 fit great but awkward to install with the long floppy pipes. XLR8 was off a bit. It took more forcing on the cats and didn't line up as well as the others on the cat-back.
They all sounded about the same. The 3" makes the car sound like a monster though.
ATLP V2 vs XLR8 V2 vs RV6 V3
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Of course no matter what pipe you choose, Heeltoeauto.com has the service and website you need to make your decision where to buy a simple one!
XLR8 V2 vs ATLP V2-R
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All ATLP Shootout
![Click the image to open in full size.]()
We spent a lot of money and time to develop an ATLP version of the XLR8 pipe with a 3" collector. And to learn that we still like the ATLP V2 best. It allows you to swap a stock cat back in unlike all the others, fits great, sounds great, makes great power...and is the least costly.
The test car was a boosted TL-S with a Flashpro and a high boost pulley. It was an automatic as well. If gains and losses are viewed as percentages we feel the relative graph data above will be indicative of what we would see on an NA J-series.
AFR and IAT were both monitored closely for consistency. No pipes required retuing to get these numbers, and tuning would not have needed noticeable differences (we played with it...it would not have). But the tune in the car was optimized when we got to it having just been dialed in on the same dyno the day before.
All tests done on the same day, same car, same dyno, same procedure:
3 pulls to heat up engine, then rest for 5 minutes, then one pull to be the one to use for the test. In all cases the "1 pull" was about on average with the rest of the pre-runs. We feel this data is all repeatable and reliable when done under the same conditions.
Full disclosure, at the time of testing and posting, ATLP is produced by Heeltoe. If anyone wants to call Church Testing to validate the test, feel free. Again, the raw data is available for whoever wants it.
Our take-aways:
- Pay attention to the scale on dyno graphs. We posted no power figures to force you to look at the scale. The first two graphs are the same, but the scales are different.
- 3" piping makes a difference, no matter what j-pipe you have. ATLP is currently the only one on the market offering a bolt-on options for it!
- The original ATLP V2 gives up power when you are driving slow, but makes more power than anything else when you are driving quicker than...well, slow.
- The XLR8 V2 is really similar to the V2-R. Pipe lengths are almost the same But we didn't test it with a 3" mid pipe to see if that makes much of a difference on an XLR8. Wish I would have!
- RV6 vs XLR8 are here and there and back and forth...but the ATLP performs best on anything above your automatic's torque converter lockup point.
- The original ATLP V2 with a Race Pipe and our 3" sections make for the option to get for the most power. The larger piping adds to the gains and helps to recover some lost bottom-range torque.
In other news, the ATLP options were easier to install. RV6 fit great but awkward to install with the long floppy pipes. XLR8 was off a bit. It took more forcing on the cats and didn't line up as well as the others on the cat-back.
They all sounded about the same. The 3" makes the car sound like a monster though.
ATLP V2 vs XLR8 V2 vs RV6 V3
Of course no matter what pipe you choose, Heeltoeauto.com has the service and website you need to make your decision where to buy a simple one!
XLR8 V2 vs ATLP V2-R
All ATLP Shootout
We spent a lot of money and time to develop an ATLP version of the XLR8 pipe with a 3" collector. And to learn that we still like the ATLP V2 best. It allows you to swap a stock cat back in unlike all the others, fits great, sounds great, makes great power...and is the least costly.