Stainless Steel exhaust

Technical Area Engine, Transmission, Exhaust etc
2

Hi All,

i have just fitted the MX5 parts stainless steel Exhaust to 

my mk1. Awesome sound but just to loud for everyday use.

options-

do I send it back for money back

Fit a muffler/silencer

 

or is the IL MOTORSPORT Exhaust that Mx5 parts also sell slightly quieter.

 

the main problem with the current one is the droning sound 

 

thanks in advance

3

Single exit?

The dual exit can be louder.

I had the single exit fitted but to a Mk2, it had a lovely sporty note to it, loved it.

I then fitted an MX5parts one to my Mk3, that was far too boomy for my liking and old ears. I changed it for a Cobalt, just the job

 

New exausts can quieten down after a little time, although on the Mk3 I didn’t find this, hence the change.

4

This is the reason why many people sell these systems.

Stainless steel systems tend to be noisier and more resonant. A fine line between what is desirable/acceptable and what is just irritating, depending on the car, owner preference, driving conditions and system fitted.

I assume there is a cat fitted rather than decat as this will quieten the system down. the back box is likely part of your system so any idea to replace it will involve removal of the system anyway.

MX5Parts may take it back - worth a try but at the end of the day this was your choice and I assume the system supplied is doing the job it was designed for. Many of us stick to standard systems or revert back to them for the reasons you have discovered.        

5

Thanks for your reply, 

 

it it is the single exit exhaust’s Fully stainless steel catback.   

I do love the sound under power and it was very easy to fit. 

Even though I am 18 and should probably like the loudest exhaust it is just drones under power when cruising. 

Mx5 parts sell the other stainless steel exhaust from the German motorsport company which I have seen some places say it is quieter

i want a sports exhaust sound but just don’t want to lose the comfort of the car when cruising.

do you know of other people having the exhaust that has got quieter overtime?

6

I recently fitted the IL Motorsport stainless steel exhaust from MX5 Parts and it is not much louder than the standard exhaust it replaced. The sound is a bit more sporty but subtly so and it doesn’t drone on the motorway. I really like it

Matt

7

Hi Rhino,

I have spoken to MX5 parts and they will accept it back which is great.

My car is completely standard but I just wanted to add something to make it more fun to drive.

I do have a K&N air filter on it as well which I suppose makes the engine louder under load

8

Hi Matt, 

 

thank you very much for your comment, would you reccomend me swapping it or going back to standard? 

 

does It sound standard while cruising (which is what I would like?)

 

thanks

Alex

 

 

9

One of my pet hates are exhausts made from say 2" tube, and then they insist on trying to fool people into thinking its bigger

by sticking a lump of 3" or 3.5" on the end. Invariably this just ruins the note in the same way as a bowler hat over the end of a trumpet.

 

I have a 2.5" on my car that exits the bodywork as 2.5" I can’t see the point of anything else.

 

Paul G

10

Thanks for the reply Paul, 

 

is yours a standard or ccustom exhaust? 

 

I just wanted an exhaust with with a sportier tone 

to go with the car.

 

thanks 

Alex

11

 

 

Hi Alex

I suppose it’s a custom ? I made it myself. Got my badge on it as well 

I do that sort of thing for a living, usually 1 offs for race cars and bespoke builds.

 

It sounds as if you are searching for the Holy Grail. (No offence intended) Bombing up the motorway at 4k revs plus you want it quiet,

but pulling out of the local pub yard you require a sporty bark ?

 

Can I suggest an electrical by-pass valve, perhaps a Yamaha EXUP valve in the system. Miss out the back box at the flick of a switch.

 

Paul G

 

12

Just my personal opinion but I’d say you can’t go wrong with a Cobalt exhaust from Moss. Lovely sporty note, not too loud and, for me at least, no droning sound when on the motorway. It sounds a bit ‘tinny’ at first but once you’ve put a few miles on it the sound deepens to a lovely growl. Also, the Cobalt is cheaper than most other aftermarket S/S exhausts.

13

Could not agree more, Cobalt is the way to go and when on offer is much cheaper than other suppliers although you might have to wait a while for the next offer. 

Had mine over a year now and still enjoy the sound it makes.

Took the opportunity to replace the Cat, hangers and a new oxygen sensor at the same time.

Good luck with your search.

Dave  

14

Alex, 

Oddly enough, ( and I run 2 Mx5’s) one a '94 and the other a 2002 Sport.

I had to remove the Mk1’s SS exhaust ( same as yours) as the combination of the SS decat & 'zorst was far too boomy right between 65/75 mph, and I reverted to an OEM exhaust which, with the decat in place, gave a nice cloth-ripping note.

On the Mk2.5, which still has it fitted, yes…it’s a bit boomy at exactly the same speeds but since the CAT is still fitted as it has to be, it’s nowhere near as bad and is “acceptable”.

I think these engines, like any other, have a resonance period around 3/3.5k unfortunatley equating to top gear motorway cruising. 

It may be…there is more to it with a combo of rev related compressions & gas compressions etc. That’s a science beyond me tbh.

Back in the day for another example, the Capri 2.8i  V6 engines (when older) sometimes destroyed the (chain driven) front sprocket bolted to the crank. It had a fibre centre damper which would eventually fail…and take the engine with it. I had an all steel replacement fitted when it was being borded/stroked and tuned by Vulcan Engineering. 

Resonance periods have a lot to answer for!