My Car/Mods:
2004 Accord EX
J30a4 6 speed manual
AEM v2 intake
Borla Catback Exhaust
RV6 V2, ATLP V1, or XLR8 V1 Jpipe with High Flow Cat (Dotted Lines on Graphs)
XLR8 V2 Jpipe/cat delete(Solid Lines)
The difference:


Testing Conditions:
The dynos were done at YCU Dyno Tuning Specialist in York, PA on their Mustang Dyno MD-500. Pulls were all done with the cars engine coolant temperature at 180 degrees. Temperature in the shop was averaging about 69 degrees(We were opening and shutting the door when the temperature was rising above 72 degrees and dropped to/below 65). Intake air temperatures were in the high 60s, low 70s before the start of each run.

The RESULTS!!!!
Before the ECU was reset.
XLR8 V2: 222.416 whp 188.071 wtq
Unknown jpipe/high flow cat: 215.371 whp 180.825 wtq
Gains: 7.045 whp 7.246 wtq
(sorry for this pic forgot to tell him to save it and send it to me.)


After the ECU was reset and had around ten 1/4 mile runs and about six power pulls.
XLR8 V2: 225.769 whp 189.962 wtq
Unknown jpipe/high flow cat: 215.371 whp 180.825 wtq
Gains: 10.398 whp 9.137 wtq

Here is the final graph.



Overall Opinion:
The pipe looks great and out performs the j-pipe and high flow cat that was on the car. I can feel the power increase while driving the car with the butt dyno. The removal and install of the J-Pipe took less than two hours. But that was with lots distractions and the car up in the air and a little cordless impact. Other tools used were sockets, wrenchs, and breaker bar. Three people were used to during this install(holding/placement j-pipe, pulling back exhaust, and lining up the holes/putting bolts in it). During the install I had one of the studs back out of a cat so we replaced it with a new one and a nut. Also im not sure if its in the directions or not, but I removed the hanger bushing and placed it on the J-Pipe before install. I give this pipe :up::up:

Also guys/ladies remember that im on a mustang dyno so my numbers may seem lower, so if you add 10-15% you will get dynojet/dynapack numbers.

 

i didnt even look under the car before buying the XLR8 V2 J-Pipe but was surprised to find an aftermarket one on the car with a high flow cat. I dont know which J-Pipe i took off the car. There are no logos or tags on it.

 

Are you 5AT or 6MT?

The gains look good for the 3rd cat delete.
RV6 Jpipe newer V3 also does this.
ATLP is currently testing a third cat delete version as well.

Thanks for posting and sharing your dyno charts as well.

 

RV6 V1/v2 are bad. Not even worth mentioning/kinda making them look bad considering you're showing a up to date xlr8 item to a v2 rv6-- need the v3.

Nonetheless, good info

 

I think the dyno is basically XLR8 V1 + resonated test pipe VS XLR8 V2.

Not bad for a slight increase in runner length..... Our RV6 V3 Jpipe runners are still long by far.

 

Ok. So now i know its not Richies Version 2.

 

i wasnt trying to make anyone look bad. Just posting some results. Was supposed to be a comparison to stock but I didnt know I had a aftermarket j pipe already.

 

Car is a 6MT. Im waiting till april/march to get my PCDs.

 

@Atlas.46:
So, that's a resonated test pipe, not a HFC?

Is there mesh inside it?

 

I will take a picture of it right now.

 

Very nice results. Definitely take a picture of the Jpipe that was previously on the car so we can better understand the comparison.

Thanks for taking the time to do this! for you.

 

Here are some pictures i just took.

 

Found out that the car had a XLR8 V1 pipe and high flow cat.

 

That's the XRL8 V1. You can tell by their merge and very small flex pipe. Very nice gains over their previous Jpipe.

From the pics, the primaries only look about 4-5in longer (if that) and still produced much more power. It'd be interesting to see the difference between the RV6 V3 and XLR8 V2. The RV6s primaries are longer, but the XLR8 merge looks slightly better. I think the gains would be negligible; meaning if someone already had either of them, it would be totally unnecessary in all forms of the word to switch.

 

That's not even a cat...those gains are even more impressive.

 

thought it was the XLR8 HFC?.....I have one and it looks very similar...

 

^There's no substrate inside of it...

 

looking at it more... it looks like a RV6 Test Pipe...

 

i thought the test pipe would yield a bigger gain than a hfc...sorry, don't know that much yet

 

Im not sure what it is.. but either way the new V2 J-pipe out performed the combo of it and the V1 J-Pipe.

 

@Atlas.46: The before & after dynos were done on the same day & ~ the same time, correct?

I wonder how much the longer primaries of the RV6 V3 Jpipe would change the outcome...

 

Our V1 j-pipe made 10-15 whp and 15-20 wtq on a TL-S that already had our catback and an AEM V2. For this j-pipe to make 10 whp/wtq over our V1 j-pipe and what looks to be a resonated test pipe is huge. I'd really like to know what our XLR8 V2 j-pipe makes over a stock j-pipe and stock cat. If anyone is willing to purchase our V2 j-pipe and do a before and after dyno we will offer you a $75 store credit or a $50 cash refund (after we receive the dyno).

Or if you're in CT and are willing to leave your vehicle for a night we can do the install and bring it to a local dyno.

 

The before and after were done the same day. With same starting temperatures(Coolant, IATs, Shop)

 

So help me understand here:

Total gains of XLR8 V2 are 10hp over stock or 10hp over gains of V1 ?

 

10whp/9wtq over the version 1 with "test pipe". But remember that i have a j30a4 so you guys should produce more than that especially if you have the PCDs. I dont have the PCDs yet.

Also my numbers are from a Mustang Dyno and they are said to read lower than Dynojet and Dynapacks.

 

So how much did V1 produce ?

 

Very nice! I have yet to dyno my car after the mods. I'd like to see the increase, but the shop that I dyno'd at before doesn't exist anymore.

 

the lower numbers in the dyno above are what were produced by the V1

 

^^^ sorry Atlas didnt ask the right questions:

V1 gains over stock = ???
V2 gains over V1 = 10whp/9wtq

am basically trying to figure out how much this jpipe gains over stock....

 

I wish I knew what the V1 gains were over stock, but the car already had the V1 installed with the RV6 test pipe. Was planning on doing a stock j-pipe/cat comparison to the V2, but that didnt happen because the car have the V1 with test pipe which i didnt know.

 

^^^....aaah.....none the less they are great numbers dude....

 

So were saying that the xlr8 v2 makes 22whp? Last dyno from v1 xlr8 was at 10-12whp.

 

^^^ well thats the claim

 

I would assume more like 15-20hp and torque tops over oem stock j-pipe with stock precats and completely oem stock exhaust system. Someone should do a base run and show comparisons from stock to this new v2 for us and should get $100 cash back for providing the dyno lol

I'm not paying you though ha

 

^^^ I thought XLR8 was doing that....

you do the dyno and he will give you $75 back or some like that....