Rear muffler is it needed

[zuk]

Just checking the muffler box at very rear is it needed,dose it afect the sound or perfomance mine has a hole was thinking of removel or repair.
Ps also instaled bypass for air bags today work great thanks Paul.

[wayneg]

No idea on effect so interested like you, was thinking the same, just bypassing it with I nice looking tailpipe. I am sure others have done this

[PaulP38a]

Don't know about performance but it will affect the sound. Put a nice resonator on there instead and enjoy the rumble of the V8.
Cheers, Paul.

[p38arover]

I don't have one. The increase in noise is minimal.

[wayneg]

I don't have one. The increase in noise is minimal.

Have you got a straight pipe or a resonator in place of the back box?

[glenhendry]

I hacked off the rear muffler hoping for a nicer, cleaner rumble and it is not louder at all!

I suspect it is specifically for lower or higher frequencies (drones or whines), but it made no difference for me. Performance or sound wise. Which is amazing, because in your hands, it is a big and heavy muffler.

I now have visions of replacing the LARGE centre muffler just after the exhaust join with a 'sports' muffler of some kind to let some of the V8 rumble out.

[Lotz-A-Landies]

The muffler is designed to reduce the pop, pop, pop sound as each cylinder exhausts. By expanding the volume of the exhaust one exhaust pop gets essentially merged into the ones before and after.

[p38arover]

Have you got a straight pipe or a resonator in place of the back box?

Straight (well, bent :) ) pipe. No resonator. There is no popping, just a slight burble.

[zuk]

Thank you Gentelmen that tells me what I needed to know looks like its gone and will put a nice crome down draft to replace.

[wayneg]

Dont forget some pictures.

[zuk]

Will have to workout how to do pic's, Glen if you do the sports muffler let us know the sound and if any power benefits, also I always use K&N filters where's the best place to buy them from for the P38 I buy them from the states for my bikes.

[glenhendry]

The advice around here is that the oil from K&Ns is very dangerous for the MAF. The MAF sensor is a very important part of the fuelling system and P38s dont like them being gunked up. If you use one, I would be very careful not to over-oil, and stick to the paper element type unless you are certain.

[Hoges]

The advice around here is that the oil from K&Ns is very dangerous for the MAF. The MAF sensor is a very important part of the fuelling system and P38s dont like them being gunked up. If you use one, I would be very careful not to over-oil, and stick to the paper element type unless you are certain.

x 2 stay well away...good product ...wrong application!!

Edit: K&N filters remind me of my Grandad's 1948 Vauxhall... it had an oil filled aircleaner... his practical joker son-in-law a.k.a. my Dad, used occasionally service it for him and amuse us all by ever so slightly overfilling the canister. ... Pop would come and collect his car and as he disappeared around the bend at a rate of knots, oil would flow into the carby mouth and lay a smoke screen like a destroyer... but I digress, it's late... :eek:

[Keithy P38]

I removed the rear muffler hoping for some noise and it didn't happen! Got a high flow sports centre muffler now and a "hot dog" in place at the rear. If you have a sports muffler and no rear one you will get a drone at highway speeds.

Keithy

[p38arover]

If you have a sports muffler and no rear one you will get a drone at highway speeds.

Which is why I still have the stock front muffler - no drone with mine.

[glenhendry]

To close out this thread, I did put in a sports muffler and nothing else. The note is excellent idling and driving, but at 2000 (100kph for me with 32"s) there is a slight resonance drone. See this thread (http://www.aulro.com/afvb/showthread.php?p=1651038#post1651038). Perhaps putting the resonator back on will allow me to keep the rumble and eliminate the drone.