RS5 Center Center Muffler Delete, X Pipe?

A5/S5/RS5
#14

A lot of people do this mod on the 3.0TFSI S4/S5. Cut out the middle resonator 5 and weld in the magnaflow xpipe there. As Justin said, the resonator is slightly side entrance, so you’ll need to add a little bit of tubing to make it work (get SS obviously and have it TIG welded).

But honestly, this is done on the S4’s because they are pretty much dead quiet from the factory, and people tend to balk at a 2k exhaust that returns little to no performance. On the 4.2, you probably will get more benefit from going with a full catback exhaust.

I did this on my B8 S4 and it was cool for a while, but there was a good amount of drone and it sounded very raspy up top. I also didn’t have it tig welded, so it started to rust. Ended up getting a nuespeed exhaust (which seems to be related to the FI exhaust that used to be sold).

Not trying to be a dick, but we’ve seen how much you’ve been willing to spend on mods before…so…makes a lot more sense to just buy an exhaust IMO. People doing this xpipe mod are usually trying to save a few bucks (at least on the 3.0TFSI).

#15

Yeah, butchering a RS5 exhaust is not smart. Regardless, there are no Capristos in the states but Todd at Vivid racing in Arizona cut me 5% off the price, $440 including shipping to East coast. He says he can get one delivered in 7-9 days. Others are saying 4-6 weeks. Thanks

#16

Also, keep this in mind: if/when you ever want to sell your RS5, you’ll probably want to put a stock exhaust back on. If you cut it up, then you can’t do that…

With the S4/S5 3.0TFSI, you will have a MUCH easier time finding someone local who is willing to swap for your aftermarket/hack job exhaust. But in your case, you will have a really hard time finding another rs5 owner to swap with.

So I would definitely keep the stock RS5 exhaust in your basement if you do indeed upgrade. Just something to think about…

#17

Vivid racing? They are still in business? (scammers)

#18

the only problem is the b8 has a supercharger compensating for a lot of shitty exhaust mods

the RS5 does not, and needs the engine to have the greatest possible opportunity for efficiency on the intake and exhaust side

doing what a B8 S4 does to try and salvage some sound out of their car can cripple performance on a naturally aspirated car that revs to 8500 rpm and relies on VE to perform

and with that, I am going to step out, and stay out of this thread. Someone gave the OP great advice to access the best exhaust manufacturer for naturally aspirated Audis, JHM, who use Fast Intentions for production. Hands down, the best performance results for the B67 S4 , the B7 RS4, and the other 4.2 Audis in NA form have come from JHM designed exhausts. All of the others have been virtually useless for performance, as they replicated stock diamters, and put louder mufflers.

But as I said, the OP has been told what works, and that’s all you can do in a forum. Now it’s up to him. There are lots of companies who will be happy to sell you a shit performing exhaust that makes your car louder.

#19

What’s VE?

#20

Volumetric Efficiency?

#21

I appreciate your sentiments but JHM makes nothing for the RS5. Will call fast intentions today. Am I correct in assuming you think there is no value in Capristo or Miltek regarding HP gains? Thanks

#22

^^ Don’t worry about HP gains - focus on 1/4 mile gains. In that regard, I believe the consensus is that, while the Milltek sounds great on the 4.2 V8, it yields zero acceleration performance. Can’t speak to Capristo.

#23

I requested info from SKN in Europe and they say over 50 HP gain. However, Part of the there mod is an intake “Airbox, Sport Airfilter, Hose”. Since the RS5 has 2 airboxes and intakes it concerns me they responded in the singular. Lost in translation? They use a Miltek exhaust and one has to ship the ECU to them.

#24

exactly. Zero hp gains. In fact, we’ve seen those products produce performance LOSSES on some platforms.

They (milltek, capristo, tubi, scorpion, klappenlangeschlange, GMG, MTM) sell poorly designed, high priced exhausts that some people think sound good. Reality is Audi designed the car’s sound, and most of the exhausts just make it louder, but credit should go to Audi for the sound. So leaving that aside, how about performance? None of those offerings have followed the age old performance recipe for a naturally aspirated crossplane V8 engine. None. Weird eh? They use poorly chosen piping diameters, jagged speed robbing bends, no crossover to promote exhaust scavenging, poorly sized mufflers…the list is amazingly long. NONE of them got it right EVER on ANY of these Audis.

JHM guys used to race Mustangs, and when they saw these Audis with V8 engines and all of the terrible products available saw an opportunity to step in and do what has been shown to work for decades on NA V8. No shock they produced the best gains and fantastic sound was a nice bonus.

#25

Skywagon…start listening to people trying to help you like we did before. Call Fast Intentions and see if you can work something out. If not do somehing locally instead of wasting your money on garbage from Europe. Anyone who is trying to sell you an intake is a fool.

#26

Just sent them an e-mail and will call when they open. Looked at their website at the pictures of the S5 exhaust. No resonators on their down pipes, no center resonator/muffler. Nice and light but too loud? Also, my car has the selectable “Sport” exhaust compounding my situation further? Starting to think the stock Sport may be what I’m going with which maybe simply the best option? I appreciate your patience and I am absorbing yours and everyone’s knowledge. Might drop by National Speed too. Also going on a lift at the dealer today for a few minutes. Never seen the underside of my car yet. Thanks

#27

Yes, skywagon, the performance recipe for a naturally aspirated high revving RS4/5 is nothing like the recipe for a turbo or supercharged Audi

B8 S4

  1. tune - stop boost bleedoff and you make big gains
  2. pulley - drive supercharger harder, good gains
  3. intake - restrictive stock intake slows the car down; open it up for good gains
    This formula has yielded approximately 50-70 whp on B8 S4s. Excellent and a real game changer.

B7 RS4/B8 RS5

  1. exhaust - eliminate cats, open up exhaust diamater to 2.75" and add an X-pipe crossover AT THE APPROPRIATE SPOT…not just randomly placed; good gains
  2. tune - JHM has had good gains by making a myriad of adjustments to the high revving 4.2 FSI on the RS4 and R8. That formula will apply to the RS5 too. Unfortunately nobody else follows it…but this is where you can make good gains.
    This formula has yielded 30-40 whp on B7 RS4s. Excellent gains and a real game changer.

Mix those two formulas up though, and they will each yield a fraction of the gains on the other platform. So you can’t transpose what you learned on the 3.0T to your RS5.

Most tuners on Audis are used to bumping the boost but that is impossible on an NA car. So most of them are stuck. APR, the biggest tuning company in the world, consistently added ZERO HORSEPOWER to B7 RS4s with their file. Shocking right? not really. They’re used to tweaking boost for 90% of the tuning gains available on 1.8T and 2.0T cars. Once you take that away, you find out they weren’t so good at finding the other 10%. That’s why they got the reputation as the ‘safe’ tuner. Really they were the ‘lazy’ tuner who didn’t really try very hard.

On an NA Audi, the tune is a different animal. You can’t just throw some timing and AFR at it and call it a day. You’ll see nominal gains. I once posted that APR’s tune only changes 4 things…ignition timing advance, AFR, rev limiter and speed limiter. An APR employee replied ‘yeah…well what else is there?’. JHM’s B67 S4 tune that we were comparing APR to made 80 changes at the time. It’s currently way north of that. Why? The tuner knows how to tune an NA car for power. He didn’t follow the turbo tuner 101 roadmap minus the turbo part. He followed the NA tuner road map.

The intake is another story. Next time you get the car nice and hot, go put your face near one of the intakes. Feel that? That’s 150 degrees of radiant heat. Want an open intake with a fancy carbon fibre top? You’ll start sucking in that hot air. Think your car can make power sucking in hot air? The DA in your engine bay is around 10,0000 feet.

You need the stock intake on that car, and on the B67 S4 and B7 RS4. And R8. Opening them up might make a 1.6 litre honda sound better, and might make a 3.0T SC V6 B8 S4 accelerate better, but it will make your 4.2 high revving FSI V8 car slower.

#28

Make sure you get a bunch of pictures :+1:t2:

#29

Saki, well this is turning into another education. Pictures of the RS5 engine dropped down, another thread this site, clearly show, as one poster stated, the RS5 cats are part of the tubular exhaust headers…welded? Obviously not easily removed. I know there is a VERY expensive system out there, Kline(?) but not going to pop for that. No matter how crazy I may be it appears stock is going to stay? Thanks

#30

Yes sir, will do.

#31

Saki, intakes? There is one out there for $3500 made in Japan and takes 4-6 weeks to construct. Allegedly it’s heavily insulated to help keep the intake air cooler. Stock system looks very capable. Started thinking about installing my Aquamist system on my RS5 but was spanked…ouch! What do you think? Thanks

#32

$3500 for an intake??? wtf :o :o :o

#33

[quote=“drob23,post:32,topic:7374”]
$3500 for an intake??? wtf :o :o :o
[/quote

Well, they lowered the price ;D

http://www.vividracing.com/catalog/-p-150714497.html?utm_source=adwordsfroogle&utm_campaign=adwordsfroogle&utm_content=137681&ph=1&gclid=CIi7--XK0MUCFZSCaQod-QwANg