[335boosted2Dmax]

Originally Posted by sitz

Okay, i'm interested to see how your cat delete mod works. Will you delete the primary cats as well? What's the plan for the secondary O2 sensor?

I believe there is only one O2 Sensor which is after the first cats (don't quote me on that) and there isn't another O2 sencor after the second cats, so you can put a test pipe in for the second set and for the first set, maybe they will come out with a flash program so that it resets the levels that the computer will read, so that you don't throw any CEL's after deleting the cats

[Hegemony]

There is no O2 sensor on the second set of cats. Only on the 1st.

[335boosted2Dmax]

Ok thanks thats what I thought

[radgator1]

Originally Posted by wj4

I called a local exhaust shop myself. They were the guys I went to a couple of times when I had my Evo. He said that he will charge me roughly $700 for a customized catback. 2.5inch all the way around with deleting the resonators and second set of cats.
Apparently there is an e90post member who got his 335i done at the same place about 2 days ago, I'm trying to meet up with him to see how I like the sound before I proceed.

What would they be using as mufflers and is that price all inclusive? Are they using Polished SS pipe?

[bnj]

Originally Posted by Cornhusker

what's a "testpipe"? Does this mean turboback or cat deletes?

Excuse my noobiness, but I have proceed and have been trying to figure out which way to go with exhaust.

Testpipe means cat-deletes (replaced by testpipes), and is thus turboback. But what do people mean by "turboback"? Am I correct by assuming that whatever system that replaces the original from turbo? To me a sensible turboback is one that has some cats so that it sniffs clean in testing. That means that it has free-flowing cats as far as possible from turbo so that the cats would not restrict the flow.

When the cats are further back they need to get warmed before the test, but that's not an too laborious when compared to the need of changing the exhausts back and forth.

[wj4]

[QUOTE][But what do people mean by "turboback"?/QUOTE]
A lot of people, including myself, think a turboback is the replacement of the whole exhaust line from the exhaust manifold(s).

radgator1-I don't remember what the guy told me to be honest, but I know the mufflers will be stainless steel. I don't really care what the exhaust line is actually made of since it's under the car anyways. I've had stainless steel and titanium catbacks on my previous cars before. While the weight difference is noticeable, that's about it IMO.

[WilyB]

Originally Posted by WilyB

Very good thread. Yesterday I had a 80-series Cross Flow two chambers Flowmaster installed in my ML55 for $475. The shop welded back the original AMG tips, so the set up looks 100% OEM, but there is a more aggressive, deeper sound at full throttle.

Got the ML back from a major 50K service and new brakes ($2,600 ) and the new exhaust makes a great "butt" dyno difference.

Standard baseline is 290 WHP. If/when the weather clears up, I am going to dyno it. I know it is very unscientific, but if the dyno gives a really higher number, say like 300, then it is probable that the inexpensive "Camaro" exhaust works well.

My 335 has been baselined, then PROceded. If I do the Magnaflow exhaust as some suggested, then we will have some new real numbers.

[CanadianTSi]

Just to clear up something...

Exhaust is generally broken down into 3 parts, first you have the Downpipe which bolts to the Turbo(or o2 housing). Then you have the Cat(or Testpipe) followed by the Catback.

[X E I O]

Look at you all
--With your pothole free expressways
--With your hundreds of cheap and somewhat trust worthy tuners
--With your proceeds
--With your nice weather
--With your 19s
--With your big driveways and garages.

NYC owns you.
But...
not our BQE (Brooklyn Queens Expressway)
not our tuners ( or lack there of )
not our roads ( or lack there of )

I'm thinking of taking a trip out there just to have my car tuned. 350/750 for exhausts, that freaking cheap man. I got a quote at 1500$ and up.

I don't care anyway. I think I'm getting tired of this coupe anyway, I test drove an X5 3.0si today and I was very very impressed. Its either that or a 535xi.

You know why?
NYC can't accomidate a 335i owner and his busy schedule.
I'm sick of this car's constant need to see the doctor. A bent wheel here, an oil change there. This car is more maintenance heavy than a Puerto Rican/Columbian woman ( or JLo for those of you who wouldn't have an idea ).

Eh...

but than again... this is NYC.
but than again... it is a 335i...

f em both.

I'm moving to Fiji

[wj4]

I'm sick of this car's constant need to see the doctor. A bent wheel here, an oil change there.

Oil change is hardly something to be complaining about since it is maintenance. Don't get it wrong, SoCal has its share of bad roads, I've seen people get nasty bent wheels driving around L.A. before.

[Sniz]

Hey guys, just got my 335 and now its tuning time. Im 100% going custom on my car.

One question, the stock exhaust is connected at the mufflers, do you think its necessary to do that on a custom....why did BMW do that? To equalize the pressure in the 2 pipes?

I wouldn't plan on doing that, but it also wouldn't be hard.

w/ a n x-pipe.

Here are a few pics of the Magnaflow I was using on my Volvo S60R boosting 23psi. Fun car! Nothing like a 325awhp Volvo as a sleeper.

And no....that isnt me!

[SoCal335i]

I'm having Royal Muffler in chatsworth make me a custom exhaust from the downpipes back. They gave me a fair price for all t-304 stainless, 2 resonators, an x-pipe, and they will be using my Autospeed Mufflers from my Audi S4 (4.2 V-8). It sounded really good and deep but not too loud on my S4 so im hoping that it sound good on this car but we will see...

[Sniz]

what price did they quote you? Sounds like it would be a very nice exhaust.

[muvaside]

SoCall335i - That's funny man , I was just there talking to Jimmy on thursday about building a custom cat-back exhaust . I was just wondering to just have a 2.5 inch starting from second cats or the first cats and ending with stainless steel Magnaflows. My whole thing is not to have a much louder exhaust than stock , but to have the most HP'er gain .

[radgator1]

Originally Posted by muvaside

SoCall335i - That's funny man , I was just there talking to Jimmy on thursday about building a custom cat-back exhaust . I was just wondering to just have a 2.5 inch starting from second cats or the first cats and ending with stainless steel Magnaflows. My whole thing is not to have a much louder exhaust than stock , but to have the most HP'er gain .

If you want to have significant HP gain I think you will need to eliminate the little resonator and secondary cats. Besides being very restrictive themselves, the pipe is very crimped and flattened around the cats and resonator, especially the passenger side pipe. I think that is partly why they put the connection between the 2 OEM mufflers and put the sound valve thing on the driver side to try to equal out the difference in restriction between the 2 sides.

[SoCal335i]

Originally Posted by muvaside

SoCall335i - That's funny man , I was just there talking to Jimmy on thursday about building a custom cat-back exhaust . I was just wondering to just have a 2.5 inch starting from second cats or the first cats and ending with stainless steel Magnaflows. My whole thing is not to have a much louder exhaust than stock , but to have the most HP'er gain .

That is a funny coincidence!! Jimmy is a good guy! Yeah i feel you on the sound, i dont want something raspy and annoying but more of an exotic deep sound that no one else is going to have. I wanted to use my Autospeed mufflers cause its not something you can buy from Autospeed (unless you buy an S4 full exhaust) so im hoping the sound will be different then all other 335's. I guess ill know next week!!

[Walked U]

Originally Posted by wj4

I ran into this thread on the M5board. The whole thing cost the guy less than $700! I must say that is a very very good deal. It almost makes me want to do a round trip to S.D. and get one put on my 335i

I've called shops around here and they all want around mid to high $1000 for a custom catback

http://www.m5board.com/vbulletin/showthread.php?t=42512

Are you serious? I got quoted 500 bucks.

[SoCal335i]

Originally Posted by Walked U

Are you serious? I got quoted 500 bucks.

$500 for what?

[Walked U]

Originally Posted by wj4

CEA3-just an idea for you and your muffler shop. What a local Evo shop did was made something called a Rally Cat. What is it? It is a test pipe with a false cat wrapped around it so it still looks OEM, but it isn't

You mean a gutted cat? I hang out with a bunch of muscle car guys that do this also. Its really popular with the american car enthusiast.

[Walked U]

Originally Posted by SoCal335i

$500 for what?

Custom cat back.

I dont have it on my car. But I do have test pipes installed. (2ndary cats / resonator delete with 2.5" all the way back to stock muffler /w H pipe )

Like charlie said you get a power inc. But I didnt get anything noticable until I changed my maps on the procede.

I did a few test runs with a few friends. Some on the board. I use to be dead even with my friends bolt on evo until 110 mph. But now I pull at 80 mph.

Charlie can even attest to the power gain on my car also.

But ill most likey get rid of the piping once someone comes out with an e90 exhaust.

[luckyguyinla]

Originally Posted by wj4

I ran into this thread on the M5board. The whole thing cost the guy less than $700! I must say that is a very very good deal. It almost makes me want to do a round trip to S.D. and get one put on my 335i

I've called shops around here and they all want around mid to high $1000 for a custom catback

http://www.m5board.com/vbulletin/showthread.php?t=42512

i have done mine second cat back to the Borla Xr-1 (2) for about 600 dollars. 3 inches pipping

[Terry335]

Do a search on the resonator/second cat delete, I've heard its very inexpensive and gives great sound.