Exhaust Q: volume of having a straight through pipe

DUTR

JustAnotherSaver wrote: »

I agree that we all have our own opinions.

However there is no need for rudeness. People can disagree, no problem. People can offer advice, no problem. People can answer a question and state facts pointing out where the other person has gone wrong ... all of that is no problem.

But there's a way to do it & it really isn't difficult. Manners and politeness, they cost nothing. Attitude & rudeness is unnecessary.

Unfortunately it happens a lot here. Maybe it's the keyboard & monitor effect where because someone can't be seen they feel the need to be a bit more of an A-hole whereas if they had the same conversation in person with someone they would respond differently. They may say the same thing basically but it wouldn't be so rude.

Thankfully there are others who aren't like that to balance things out.

I still don't see where the rudeness is you refer to other than yourself writing not to post on a thread, the simple solution is to just ignore it and move onto the next post, as the things you may not like from time to time won't change, I'm certinly not being a keyboard warrior if that is what you are mildy implying, trust me I say a lot more in real life when the time applies, there is the old saying don't ask someone a question if you may not like the answer.
However after all that and the thread has gone off topic it's just one of those things in life where folk will have to agree to disagree :cool:

onomatopoeia99

JustAnotherSaver wrote: »

I had a stainless system on my car. Earlier in the year the downpipe badly rusted so i just replaced it with a standard pipe - no stainless.

:eek: My car left the factory with a stainless steel exhaust system. That was in 2000, it's still fitted has done 124,000 miles and no corrosion yet. The problems I've had with aftermarket stainless systems in the past have been splitting rather than corrosion.

To answer your question, replacing the middle box on pretty much any car with a straight pipe will make it a lot louder and normally leave it sounding pretty rough. In my youth, I might have experimented a bit :rotfl:, but found I couldn't live with the results, never mind what other people in the street might have thought, so such changes were never on the car more than a few hours.

System

Does your car have a turbocharger? If so then you'll notice no difference.

interstellaflyer

Why not just get it fixed properly?

JustAnotherSaver

onomatopoeia99 wrote: »

:eek: My car left the factory with a stainless steel exhaust system. That was in 2000, it's still fitted has done 124,000 miles and no corrosion yet. The problems I've had with aftermarket stainless systems in the past have been splitting rather than corrosion.

Superior material quality?

I don't know whether it's a factor but i really don't do so many miles. I cover 6k per year that's all.

And the last hole i got in mine plus this one, neither have been actually on the pipe itself, they've been on joints both times.

Tarambor wrote: »

Does your car have a turbocharger? If so then you'll notice no difference.

It doesn't have one no

and i did notice a difference actually (when i had the stainless fitted)

interstellaflyer wrote: »

Why not just get it fixed properly?

Well i've mentioned i have a hole in the exhaust & i'm talking about actually having both pipes removed and replaced.

So if this is not "fixed properly" then what would be a proper fix?

Welding?

Retrogamer

I've had a few aftermarket exhausts in my time.

I've had a straight pipe from the turbo back with no silencers or boxes and it wasn't too loud, but it was a diesel and they tend to emit lower frequency tones from the exhaust and the turbocharger blades before the exhaust dampen a lot of noise when driving normally.

You can get "straight though" silencers / boxes fitted as well. So the tube goes straight through with no bends or internal routing so gas flow is unhindered, but the straight section through the box is baffled via some holes in the side and fibreglass sound deadening around it.

Standard silencers / resonators tend to re-route the pipework inside them to dampen the noise more effectively.

If it's a turbo diesel, my preference is a small back box, no centre box and a "free flow" (cough) cat

If it's a petrol then i wouldn't recommend removing the centre box at all as it tends to generate a lot more drone when cruising on the motorway and it seems to create a bit more of a rasp type noise from the rear.

Petrol i'd prefer performance manifold, standard cat, standard centre section and performance backbox. Keeps it sensible with noise levels but changes the tone.

Gloomendoom

Retrogamer wrote: »

If it's a petrol then i wouldn't recommend removing the centre box at all as it tends to generate a lot more drone when cruising on the motorway and it seems to create a bit more of a rasp type noise from the rear.

I have petrol car with a straight through stainless large bore exhaust. There is an absorption type back box.

It isn't too bad noise wise except at motorway speeds where the constant drone is tedious, particularly with the roof up.

Robisere

OP you don't mention which make/model you have, but Ricard 53 gave you the best answer: mess with the back pressure designed-in to your car's exhaust system for that car's engine, and you can wind up with problems in performance.

I was a workshop foreman in a garage which specialised in Classics and the occasional Custom Build. We could not afford the equipment needed to measure and set up exhaust systems for specialised engine builds, but would take them to a specialist workshop many miles away. I would flatly not build any vehicle/engine combination without doing this and asking the owner to sign-off the build as we prepared it, with photos, on the invoice.

Car manufacturers of new models spend a lot of money in developing the right exhaust system for each vehicle and each engine, for the fuel used.

JustAnotherSaver

The car is nothing special, not even a turbo. It's a 16 year old Astra 1.8 petrol.

I bought the car about 2008 & had the stainless fitted probably early 2009 at a guess, certainly no later than 2010. Was a Cybox catback system off of eBay which i believe is/was just rebranded Peco. Not the big daddy by any means.

Whether it gave a difference in performance or not i don't know because i also at the same time did the Vectra C intake mod as well as K&N air filter as at the time this triple mod appeared to be all the rage in the Astra world with various claims of performance enhancement.

It was only a few years later that a chap went for a RR day and tested out a few runs with various setup - Vec C intake, standard intake, K&N air filter, standard filter & so on. There were differences but not what was claimed. I can't remember the exact results & the forum has gone so i'm not going to pretend i can remember them.

I started off with a square oval tail pipe but quickly regretted it. Way too large. I eventually sold this off & got a 3" round inwards rolled tip. Much nicer.

Anyway i'm waffling. The car is booked in this week to have both pipes changed for standard.

Back to the peashooter tail pipe for me.