RPI with Silencers

[fdagen]

Well, I finally got around to doing a pile of mods to my Z4M. I recently installed Evolve CF Airbox, Euro headers w/relocated O2, and RPI exhaust. As planned the RPI's blew my ears off. But, I was prepared and bought a pair of silencers from RPI for just this type of issue. After installing the silencers I have to say they have made a huge difference! So far, I have only been able to try them out around town, but it is night and day so far! In my opinion, they sound great now! Also, I can take them out when I am concerned about performance. I haven't had a chance to try them on the expressway yet, but if all goes as planned the drone and volume will have been significantly reduced. I am surprised no one had tried this yet? Or, at least I wasn't able to find anything on the forum prior to purchase. Now, you can have the great looks and sound of RPI at a manageable volume and drone!

[Arsonism]

I had no clue these even existed. Will be doing more research from home... not work.

[inTgr8r]

what do you mean by silencers?
nm. found them for the 5er





in the oooold days we used to use a large washer.

[fdagen]

This type of setup for our axle back exhaust.

http://www.m5board.com/vbulletin/m5-...silencers.html

[Nate4641]

fdagen, can you get pics of your setup? I'm certainly curious. This would be a lot better than switching back to the stock exhaust every time I go on a longer drive and want to keep my hearing.

[fdagen]

Its exactly what is show above, except I only have two silencers due to the fact that our exhaust only has two of the larger outlets. You drill a hole from the bottom of the exhaust up and and screw in the baffles, so the screws are not visible at all. You can see the silencers now, but RPI says they will blacken over time an you will not be able to see them shortly. I will post a pic sometime this week.

[Nate4641]

Cool. I contacted RPI about getting a set. I'll probably paint them black ahead of time. I honestly never heard of them making these as an option.

[XMetal]

Looks restrictive...sorta defeats the purpose of having a "free-flowing" or "free-er flowing" exhaust

[Nate4641]

Originally Posted by XMetal

Looks restrictive...sorta defeats the purpose of having a "free-flowing" exhaust I'm willing to wager that it's more restrictive than stock.

I think the point is the quiet the exhausts down in a non-perminant way. The RPIs are notoriously loud and being able to keep them on but hear yourself think while driving would be nice. That's why I want them at least. That and my girlfriend wont hate riding in my car! Well maybe she'll still hate the way I drive, but at least she'll be able to yell at me.... Now I'm starting to rethink if I want these...

[XMetal]

Originally Posted by Nate4641

I think the point is the quiet the exhausts down in a non-perminant way. The RPIs are notoriously loud and being able to keep them on but hear yourself think while driving would be nice. That's why I want them at least. That and my girlfriend wont hate riding in my car! Well maybe she'll still hate the way I drive, but at least she'll be able to yell at me.... Now I'm starting to rethink if I want these...

If the exhaust is too loud for me, I would yank it off and go the route of finding a quieter muffler, yet still free-flowing, rather than trying something that may adversely affect performance...but that's just me. Why do you guys get an overly loud exhaust and then try to quiet it down by restricting it? Not sure I understand this logic

[fdagen]

It has been proven on a dyno by rpi that adding two of these has a negligible effect on HP and they can be removed at any time. I believe you gain 7hp by adding RPIs and loose three by adding the silencers. Still a net gain. I bought these for both performance and looks as well as sound. Now I get the same exotic sound in a more enjoyable way for me and everyone around me.

[inTgr8r]

how much is RPI charging for these?

[fdagen]

~$25-$30 a piece I think.

[Beedub]

im in!!!!! want want want... do the cans need to come off for these to be initially fitted??

[Beedub]

pics please :-)
wonder if they'll do us a GB on these??

[Arsonism]

Originally Posted by Beedub

pics please :-)
wonder if they'll do us a GB on these??

I thought the same thing, and then I saw the price above and thought... on 35 -40 bucks? probably not.

I do not doubt at all that they will blacken.

Good find on these again.

[Beedub]

Originally Posted by Skiddish

I thought the same thing, and then I saw the price above and thought... on 35 -40 bucks? probably not.

I do not doubt at all that they will blacken.

Good find on these again.

definitely, I've been considering getting rid of the RPI setup for a long time, it just got took loud for my after my DKF section 1, it was bloody loud before but it got crazy after the section 1 was installed, literally shakes the car, so on long journeys id like to stick these in and enjoy the car.... its currently that loud I'm not actually enjoying it tbh... these new add-ons will allow me to enjoy best of both worlds :-)

I've contacted RPI and will be picking up a set ASAP! hopefully its a nice simple install.

[fdagen]

Just throw the back of the car on Jack stands. Get a 3/8 stainless bit and 15 mins later your all set. Just be careful with the drill bit walking, mine did on the second one, and I am mad that it's not perfect. 😜 But oh well, don't sweat the small stuff.

[RPIpower]

Hi guys, the silencers will fit any of our exhausts with 3.5" tips. For the Z4M exhaust, it will fit the larger of the tips only. A lot of the exhaust gasses will be diverted to the smaller tip which will reduce drone significantly. As for a GB, I'm not too sure what we can do on it. We do not even wholesale the silencers. It's one of those things we hate to make because there is no profit in it, but we feel bad charging our loyal exhaust customers a lot for them.

[Beedub]

ordered a set today :-)

OP any pics of your installed??

[RPIpower]

An easy way to install it is to put the silencer all the way in as far as it will go. Then pull it out about an inch, mark where you need to drill and then drill in a low speed setting.

One of the things I do sometimes is spray paint the silencer black if the person doesn't like the look of it. If you guys need help or have questions, don't hesitate to ask.

[inTgr8r]

Originally Posted by RPIpower

An easy way to install it is to put the silencer all the way in as far as it will go. Then pull it out about an inch, mark where you need to drill and then drill in a low speed setting.

One of the things I do sometimes is spray paint the silencer black if the person doesn't like the look of it. If you guys need help or have questions, don't hesitate to ask.

on the Z4M would it pull out just past the side pipe, or block the side pipe?
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