I don't think he's here anymore...upgraded to an Audi S7 so he's probably on an Audi forum. He was running a 2-1/2" dual X-pipe syatem from the exhaust manifolds back. He sold his exhaust system to me and I installed it on my car, with a little modification since his was RWD and mine is AWD...a slight fitment issue around the AWD transfer case which was easily remedied with flex connectors. He was running the stock mufflers and I think he did a muffler delete on a few runs. I am running the sport mufflers which are a straight through design. It does add a little more power and sounds awesome.Malbec 56 Beast wrote:Hey Majesticking,
I just watched your video, is your car stock. It appears that there is a power adder.
Is that so
Andy
There are two types of Stillen; axle back and cat back. The Stillen axle back and the Infinit Sport mufflers are pretty much identical as they are both polished stainless steel straight through design. The cat back Stillen replaces the resonators as well as the mufflers. Stock pipe size is 2" diameter, and the Stillen may be larger but I am not sure.Malbec 56 Beast wrote:I'll try to pattern mine after yours
Have you heard a Stillen exhaust, what is your comparison of the two?
Thanks for the reply
Andy
I'm middle aged so not looking for a old school muscle car sound.
While you are correct that exhaust modifications do affect the engine in various ways, I think you're just a victim of coincidence and bad timing. Your aggressive driving to hear the exhaust pushed the transmission control system the last few steps off the cliff.Also considering going back to shop and reducing diameter of 2.5" X-Pipe. I'm no mechanic but some 6th sense is telling me I could be having a vacuum or backpressure issue.
Yeah, it might be worth another shot, maybe a professional attempt this time? Dealership transmission flash + fluid change.I recently reset ECU and I feel like it improved things quite a bit. The transmission never clunks into gear anymore after ECU reset. Probably worth another shot.
Hey bro in your exhaust setup using the SLP LOUDMOUTH RESONATORS did use the stock mufflers, add sport mufflers or just did muffler delete and added tips?paranoidjack wrote: ↑Fri Mar 01, 2019 10:12 pmMy local shop did an absolutely fantastic job. I opted to keep the SLP loudmouth resonators I had purchased, and ran 2.5" pipe straight back, deleting secondary cats. The sound is perfect. At warm idle it is almost silent with a beautiful PUT PUT. At WOT it snarls.
EdBwoy wrote: ↑Tue Feb 26, 2019 12:55 pmWhile you are correct that exhaust modifications do affect the engine in various ways, I think you're just a victim of coincidence and bad timing. Your aggressive driving to hear the exhaust pushed the transmission control system the last few steps off the cliff.Also considering going back to shop and reducing diameter of 2.5" X-Pipe. I'm no mechanic but some 6th sense is telling me I could be having a vacuum or backpressure issue.
Heck, people have gotten away with more drastic exhaust work.
Yeah, it might be worth another shot, maybe a professional attempt this time? Dealership transmission flash + fluid change.I recently reset ECU and I feel like it improved things quite a bit. The transmission never clunks into gear anymore after ECU reset. Probably worth another shot.
I understand that the timing was odd in that the issues started immediately but:
1. Was the exhaust mod permanent? If not, I would try to reverse the changes and see if the problem goes away just as suddenly as it showed up.
2. Maintenance before modification - that's my motto.
Whether or not the exhaust is the issue, I would get the maintenance addressed as you also mention. At worst, you improve the longevity of your car with no visible short term benefits... At best, your driveability issues go away immediately after the maintenance service; plus you can keep exhaust sound if you like it.
That's how I'd go about it, so I'm not chasing my tail making changes and then spending money to return the car to a stock tune/performance.
Awesome! That's great to hear, and you are welcome. You took care of some maintenance AND kept the sound you wanted.billsindabowl05 wrote: ↑Thu Apr 04, 2019 8:13 amEdBwoy wrote: ↑Tue Feb 26, 2019 12:55 pm
...
2. Maintenance before modification - that's my motto.
Whether or not the exhaust is the issue, I would get the maintenance addressed as you also mention. At worst, you improve the longevity of your car with no visible short term benefits... At best, your driveability issues go away immediately after the maintenance service; plus you can keep exhaust sound if you like it.
...
I hope this formatting comes out correct.
I just want to say thanks for your insight on this issue. I tried the maintenance before modification method and changed transmission fluid, and now it shifts perfectly. I feel so thick for getting so wrapped up in troubleshooting the mod rather than just listening to the car. In any event, the car sounds great and runs even better now! Good times ahead.
DKASM37 wrote: ↑Mon Sep 19, 2016 1:46 pmThat being said I picked up 20-25 hp and nearly 2 mph in the 1/8 deleting the post cats and adding a 2.5" X-pipe into the stock rear mufflers. I gain another 2.5 mph in the 1/8 with the cut-outs open. That is about a 40 hp gain with the stock exhaust manifolds and primary cats in place.
The HPS intake tubes and K&Ns work very well for me too.
I can also tell you that a $0.25 680 ohm 1/4 watt resistor was worth nearly 2 tenths in the 1/8 on a 95°F day. IAT based spark retard KILLS the performance of these cars.
JimSim20 wrote: ↑Tue Apr 21, 2020 2:30 pmDKASM37 wrote: ↑Mon Sep 19, 2016 1:46 pmThat being said I picked up 20-25 hp and nearly 2 mph in the 1/8 deleting the post cats and adding a 2.5" X-pipe into the stock rear mufflers. I gain another 2.5 mph in the 1/8 with the cut-outs open. That is about a 40 hp gain with the stock exhaust manifolds and primary cats in place.
The HPS intake tubes and K&Ns work very well for me too.
I can also tell you that a $0.25 680 ohm 1/4 watt resistor was worth nearly 2 tenths in the 1/8 on a 95°F day. IAT based spark retard KILLS the performance of these cars.
Don't take this the wrong way but I'm just gonna say what's on a lot of people's minds... "We don't believe you, you need more people"!!!
Data to back it up???
Tell me about the 680 ohm 1/4 watt resistor?? I recently got an 2013 M56. Is this something I could do to my car for better performance?
Tell me about the 680 ohm 1/4 watt resistor?? I recently got an 2013 M56. Is this something I could do to my car for better performance?JimSim20 wrote: ↑Tue Apr 21, 2020 2:30 pmDKASM37 wrote: ↑Mon Sep 19, 2016 1:46 pmThat being said I picked up 20-25 hp and nearly 2 mph in the 1/8 deleting the post cats and adding a 2.5" X-pipe into the stock rear mufflers. I gain another 2.5 mph in the 1/8 with the cut-outs open. That is about a 40 hp gain with the stock exhaust manifolds and primary cats in place.
The HPS intake tubes and K&Ns work very well for me too.
I can also tell you that a $0.25 680 ohm 1/4 watt resistor was worth nearly 2 tenths in the 1/8 on a 95°F day. IAT based spark retard KILLS the performance of these cars.
Don't take this the wrong way but I'm just gonna say what's on a lot of people's minds... "We don't believe you, you need more people"!!!
Data to back it up???