Xoutpost.com - improving exhaust note

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Quote:

Originally Posted by RGX5

I guess that depend on how they define "power". There's a formula for it using torque and horsepower. Sure, lots of sytems will give you "power" as in horsepower, but maybe it makes it all above 4500 rpm. then look at the chart and see what happened to the torque, which is the twisting force that defines pretty much what you feel off the line, (stop light etc). Many times the torque is down from an exhaust mod (or in days past a cam mod). For me the difference I feel , and how little I have to hit the throttle now made it clear to me in my specific case. What I had was not tested, or dyno'd etc. It was put together..a muffler and some striaght pipes. Just when your thinking of adding a new exhaust, look for or ask for the dyno chart and look at torque at the lower rpms and horsepower at the higher rpms. I'm sure there are lots of well designed systems out there, but most engines mods have some sort of drawback..Dinan is one I would tend to trust since they are endorsed by BMW.

Thx. I am really looking for more low end torque and pedal sensitivity as you say.

The sound gets even better. We picked up torque and hp. You will get a slightly snappier throttle based on what we saw on the 540.

I will be doing this to the X5 soon.

Changing anything after cats will generally not hurt torque. The cats create all the back pressure that the system needs for street torque. If you are catless, that is a different situation all together.

RGX5 is right in 99% of the cases. You cannot create HP when changing from one efficient exhaust to another, you just move the curve, as discussed.

I would really like to comment on the Dinan comment in more detail, but I will leave it with this. Dinan is NOT endorsed by BMW. Some independently owned BMW dealerships sell Dinan (some also sell evosport, RD, ACS, etc). Those dealerships also service a Dinan warranty (as they do with evosport, RD, ACS, etc). Don't believe, call BMW NA and ask! Just want to clear that up. I am not commenting on the quality or value of the products (being politically correct here), but I feel that I need to clear this up, as people are making buying decisions based on incorrect information.

As for aftermarket X5 exhaust, I would stick with Eisenmann as the best off the shelf system out there. The Superspring makes maybe a lil more power and torque (especially with their x-pipe), however, we dropped the line due to a LOT of unpaid warranty claims and premature failures. Buyer beware! Anyone can search M3forum or bimmerforums for the history of this. I would be carefull with Remus, they have a history of rusting out (this may have been addressed, but we saw a lot of it). ACS X5 exhausts are made by Remus. The maganflow mufflers are the best bang for the buck if you want to have a local shop do a custom system for you (same design as Supersprint, less $!

Thanks
Brad

Quote:

Originally Posted by otoupalik

I would really like to comment on the Dinan comment in more detail, but I will leave it with this. Dinan is NOT endorsed by BMW. Some independently owned BMW dealerships sell Dinan (some also sell evosport, RD, ACS, etc). Those dealerships also service a Dinan warranty (as they do with evosport, RD, ACS, etc). Don't believe, call BMW NA and ask! Just want to clear that up. I am not commenting on the quality or value of the products (being politically correct here), but I feel that I need to clear this up, as people are making buying decisions based on incorrect information.

As for aftermarket X5 exhaust, I would stick with Eisenmann as the best off the shelf system out there. The Superspring makes maybe a lil more power and torque (especially with their x-pipe), however, we dropped the line due to a LOT of unpaid warranty claims and premature failures. Buyer beware! Anyone can search M3forum or bimmerforums for the history of this.
Thanks
Brad

Great post thanks for sharing this info. You´re absolutely right regarding Dinan not being related with BMW, there are some dealers who work with them, but not the BMW official brand.

Regarding the exhaust, I didn´t know supersprint had a X pipe for X5!! Did the X pipe gave any problems on this model? What are those stories you´re talking about? I would be interested to see pics and detailed info about supersprint X pipe if you have any.
Do you know if the Remus exhaust gives any Torque or Hp?
Thanks in advance :thumbup:

J.Seven

Quote:

Originally Posted by gregwx5

I have a 3.0i and I removed the resonator and put in straight pipes..I already had the supersprint, so now my car sounds like a monster. There are no sensors involved anywhere near the resonators.. so there is no problem removing them... but for the V8's I think people reccomend putting in the X-pipe instead of straight pipes...but the cost is very similar...go for it...it will prolly sound amazing!

have a sound clip??

Ok, I just found the X pipe made by supersprint, here´s the link with pics.
http://www.supersprint.com/homeuk.htm

I have already a custom made X pipe, but it´s not made from stain still, and I believe with time it will rust. I was thinking on buying this supersprint X pipe.
otoupalik, do you think it will work fine with the Remus exhaust I´ve already installed?
V8 4.4L we´re talking about.

J.Seven

Quote:

Originally Posted by J.Seven

Will it fit on a 4.8is? I checked the website. All they have for the 4.8is are exhaust tips:(

Quote:

Originally Posted by J.Seven

You can coat that mild custom x-pipe with a 2-stage Ceramic Thermal Coating and it will NEVER rust!

I will never buy nor recommend anyone to buy Supersprint after what we went through with them. :damn:

Thanks
Brad

damn - you just picked up a 4.8 to add to the fleet????? You suck! LOL

Quote:

Originally Posted by otoupalik

damn - you just picked up a 4.8 to add to the fleet????? You suck! LOL

LOL, Hey Brad:wavey:
Its been a while. Hope all is good over there in sunny California. I miss it a whole lot. You guys finally dumped supersprint:cheer: Thats a good thing. Im just waiting for my headers to crack on the m3. Any day now...lol.

The 4.8 is amazing. Me and my mom dumped every penny we had into my dad's new Bday present (Conti GT). It arrives on the 20th of this month, so i sorta jacked his X5 a bit early. He doesnt mind though. Considering he didnt have to pay a penny for his new toy:D

Edit: Forgot to mention how much i miss those track days with you guys at willow springs. Good times man....good times.

dude - sweet! (in my best Ashton voice)

Hey - fly back anytime, we have these cars all available for rent: e30 m3, e36 M3, e46 M3 and e90 325. All are race cars!

Glad to hear all is well, it has been a long time! Simon was supposed to visit his family in B-town, but the hostilities kept him from going. =^(

Thanks
Brad