More On Dinan Exhaust,Throttle Bodies, and Software -- Photos of Exhaust Now Up
Because I apparently have nothing better to do, ouichI called Dinan again and nagged them for some more definitive information on the exhaust, throttle bodies, and software.
Exhaust: The exhaust system consists of mufflers only, which are all stainless steel with an anti-discoloration thing-a-ma-bob that keeps the tips untarnished from heat. The tips are 3" wide, and there are four of them. Stated HP gain: 9 at redline
Throttle Bodies: They are still "30-60" days out. A K&N intake system is included, but as far as I could tell, that "system" is simply an air filter. Estimated HP gain: 15 at redline
Software:They are actively working on a software upgrade. Again its "30-60" days out. I was told that it improves SMG shifting, allows for higher revs in each gear, and among other things, it removes the governor (read: Fast!). There is an expected HP gain from this upgrade, but I was not able to nail it down as it is still a work in progress. It sounds like a pretty comprehensive upgrade....price is currently TBD....of course
I'm not really sure why they pulled out the entire system, and they don't seem to know why either oohhh: . So its a guessing game.....perhaps it had to do with the 3.91 differential.....or maybe its just easier to stick the new mufflers on....
Photos of Dinan exhaust are now on Dinan's web site: http://www.dinanbmw.com/ The description is as follows:
The Dinan M5 exhaust system provides maximum flow characteristics for optimum power gains while producing a civilized, yet very sporty exhaust note that is appropriately aggressive at wide open throttle. And there's none of that irritating low rpm "drone" that is common with so many aftermarket mufflers. The mufflers are manufactured from 100% 304 stainless steel inside and out for maximum resistance to corrosion and nearly a 30% reduction in weight, eliminating over 20 lbs.
The four 3.5" diameter polished stainless steel tips not only give the car a more aggressive look but also feature Dinan's new "Cool Tip" design that effectively reduces temperatures in order to minimize radiant heat that can effect body work over time, as well as avoid discoloration of the tips themselves. The Cool Tips also avoid the possibliity of a nasty burn while loading items in the trunk. Employing the principle of rarefaction, the design features an inner and outer tip with a vent at the base. When a positive pressure wave travels to the end of an open pipe and is ultimately expelled into the atmosphere, a rarefaction or momentary drop in density of the surrounding air is created behind it. This momentary drop in the density of the air surrounding the pipe's exit creates a vaccuum, pulling the air from the surrounding area to fill the void. The vent at the base of each outer tip then enables air to be drawn in, effectively cooling the tips
Utilizing the factory brackets and hangers, the Dinan exhaust mounts in a factory-like fashion for a perfect fit and clean installation.
I've been waiting for a long time for the exhaust to come out, now some one post a clip on how it sound so i can make-up my mind on wich exhaust to get.
I'm interested to hear what they sound like, too. FWIW, I just recently had the Dinan S3 signature package (supercharger, throttle body, exhaust, etc. - the works) put on my X5 4.6is, and the exhaust tips look exactly like the new E60 M5 tips.
If the M5 exhaust sounds anything like what went on my X5, I think a lot of people will love it! The sound on mine is fan-friggin-tastic; great, throaty low rumble at low RPMs, and a beautiful racy voice when you step on it. Almost everyone who gets in the car now (well, guys anyway) say's, "Wow, this thing sounds MEAN!"
I'm sure the sound of the M5 exhaust will be somewhat different (for one thing, the stock sound of the M5 is considerably more aggressive), but I'm guessing it's going to sound NICE...
Most of their other exhausts are worth 3, so that would be my guess for this one as well.
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