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Discussion Starter #1
I recently received some new mufflers (Ford Racing PN M-5230-S). They are pretty ratty looking right out of the box with lots of residue on both ends - probably a byproduct of welding.



A TS member previously wrote about cleaning the ends with an Aluminum polish so I decided to give it a try. I used Mothers Mag and Aluminum polish and cleaned off the ends. Real easy process and it makes the mufflers look way better.



 

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Discussion Starter #2 (Edited)
Here are the instructions that I followed to install the the mufflers on my car.

The muffler I installed on the driver's side is the one on the top as shown in this photo - note the rear hanger pin is installed higher up on the pipe (closer to the inlet end). Everything fit and aligned properly so I assume this is correct.



Here are the tools & supplies I used to install the mufflers:
1. 13mm combination wrench with a ratcheting end (this will be your friend while removing stock mufflers - a very useful tool)
2. 16mm combination wrench
3. 3/8" ratchet wrench with 13mm (deep & std), 15mm & 16mm deep sockets and an extension.
4. 3/8" Torque wrench.
5. Anti-sieze (optional)

I backed up my car onto ramps to raise the rear end up allowing more room to work under the car. Apply the parking brake and block the front tires.

I started by removing/replacing the stock muffler on the passenger's side.

1. Loosen the muffler clamp with a 16mm deep socket or wrench.



2. Loosen and remove the two bolts on the front hanger/isolator. I used a 13mm ratcheting combination wrench which helps tremendously. The side bolt is not visible so you'll have to loosen it by feel.



3. Loosen the two bolts on the rear hanger/isolator and remove the side bolt leaving the bottom bolt attached (but loose) to support the muffler.



4. Make sure the muffler clamp is loose enough, then support the muffler body and remove the remaining rear hanger bolt and carefully wrestle the muffler out.

5. Transfer the two hanger/isolators to the new muffler - this is the passenger's side muffler. Maintain the same orientation when transferring the hanger/isolators - the rubber pin holders should be on top as shown; the mufflers will not align properly if the orientation is reversed.



6. This step is optional - I applied a small amount of anti-sieze to the threads of the four hanger/isolator bolts. I heard of one person breaking off a bolt while attempting to loosen it; this is to prevent that from happening.

7. Insert the intermediate pipe into the new muffler inlet and install the side bolt into the rear hanger; the side bolt is more difficult to align and is easier to do without the bottom bolt installed. Once the side bolt is started and finger tight, install the bottom bolt finger tight. This will hold the muffler in place. The KR muffler body is much smaller than the stock ones so there is more room to work when re-installing the hangers.



8. Install the side bolt into the front hanger. Once the side bolt is started and finger tight, install the bottom bolt finger tight. Tighten down all the bolts enough to secure the two hangers - I torqued these later.

9. The muffler inlet pipe must be mated to the intermediate pipe end such that the button bottoms out in the notch on the muffler end (see picture below). Then tighten the clamp with a 15mm socket. I torqued the clamp bolt to 40 lb-ft in a two-step increment - first to 35 lb-ft and then to 40 lb-ft.

You can see in the pictures below that there's much more room to work under there and access the hanger bolts with the smaller mufflers.



10. Finally I torqued the four hanger/isolator bolts to 18 lb-ft.

11. Repeat steps with driver's side muffler (photos below). My car is a 2007. I understand that on 2008+ cars, the front driver's side muffler hanger/isolator is mounted with three bolts instead of two.





Make sure the tips do not come into contact with the plastic diffuser. The tips on my car centered up well so no tip alignment was neccessary on my part.

You'll notice the difference as soon as you fire up the engine. I am very happy with these mufflers!
 

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Just finished putting these on my car yesterday and I'm very pleased with the sound. Instalation was a breeze and everything fit perfect first time around. Mine were pretty ratty looking out of the box also so I took your advice and polished them up with Mothers before installing them. Cleaned up real nice. Thanks for the post with the tips, saved me some time on the install.
 

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Discussion Starter #4
I have read that Windex works for cleaning the residue off too - so there's nothing magical about Mother's - it's just what I used and it worked well.
 

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Thanks 6-Speed, your photo documentation just saved me about $125, which I'll put into the FRPP suspension package!
Frisco
 

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Discussion Starter #7
Thanks 6-Speed, your photo documentation just saved me about $125, which I'll put into the FRPP suspension package!
Frisco
You're welcome guys - glad I can help.

Frisco - how do these mufflers sound with the shorty headers? I know they sound great with the stock exhaust - quiet when you want them quiet and loud when you need them to be as well - perhaps not as loud as some would want but perfect IMO.
 

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6-Speed,
I'll let you know as soon as I've got the KRs on....probably this week, but I can tell you they do produce a deeper, throatier tone even with the stock muffler setup. They also look awesome in the engine bay with the silver ceramic coating. The dealer said they put twice as much time installing them than they quoted me even when installed at the same time of the TSB. A pretty tight squeeze!
frisco
 

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I just put mine on on Sunday, love how they sound. Much quieter than my 5GTs, but sound awesome outside the car.

I have a SLP Catted X-pipe sitting in the garage that I am going to try soon, hopefully it will make them a little louder.
 

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Wonder what a old fashion cherry bomb muffler would sound like with some some nice tips?
 

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Nice write up Ivan!
 

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It was 50 degF here today, so I read the write-up, ran out a bought a few tools, and 2 hours later, fired it up with the KR's on. All I can say is AWESOME! It sounds amazing.

Thanks for the write-up / pictures, as I am sure you made my project go smoother than it would of without the help!
 

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Just installed my M5320-S mufflers today.

Picked them up when I was in the USA from BuyFordRacing.com US$499.00

Thanks very much for the detailed installation instructions and in particular about the ratchet combination wrench which really made it easy.

Mufflers sound great!
 

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Great info and pics! Thanks.

Any drone with these? I am ready to order, but need to avoid the drone and keep noise reasonably low.. Yet I would really like to be more aggressive than stock.

Corsa have been recommended too. Others seem to have reports of drone and I was hoping to avoid added sound insulation.

Thanks for the advice in advance.
 

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Tried to install mine today, but could not get my Borla muffler pipe to release from the mid-pipe (over axle section).
Anyone else had any issues getting the two pipes to seperate?
 

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Tried to install mine today, but could not get my Borla muffler pipe to release from the mid-pipe (over axle section).
Anyone else had any issues getting the two pipes to seperate?
Had to recruit some assistance, but with some persistence she should break free.
 
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