To straight pipe or to not straight pipe

[dorifta]

hey guys

been thinking for a while now to remove the rear muffler assembly n weld a straight pipe (on the left side of the car)... so i know the old muffler hole thingy on the right will be naked and i dont plan on cutting the left side of the bumper either (so when the times comes to sell up, will still look nice n clean).


i don't really mind about the noise, im used to straight pipes n external wastegates I'm more worried about the whole backpressure thing... but then again there are "no restriction" mufflers on the market so im hoping i will see a power gain?

thnx in advance

[Adam_NAclubman]

I just had a new exhaust made with a highflow cat and a straight-through muffler, I can't see that those mufflers would provide much restriction at all, if my hand was smaller I reckon I could have put my fist through it

[dorifta]

and hows it feel now? less torque but more power?

[Juffa]

i don't really mind about the noise

Does that also apply to those that live with or around you?

[dorifta]

i don't really mind about the noise

Does that also apply to those that live with or around you?

Each to their own.

[bruce]

It would sound terrible and and there would be no gains (it's only a 1.6 litre!)

[dorifta]

all the miata spec races in the us run straight pipes n i reckon they sound awesome


ps i never knew nbs had 1.6trs

[bruce]

Just quietly, those cars are a little modded so would sound difft to a stock motor.
1.6 or 1.8 - it ain't no ball of fire, so ain't gonna benefit. Perhaps you can cheese off your neighbours enough so they'll put in a complaint to the Police

[dorifta]

Perhaps you can cheese off your neighbours enough so they'll put in a complaint to the Police

I highly doubt that, I live in the city at the corner of one of the busiest intersections in melbourne which is mainly populated by trucks throughout the day.

There's 3 hospitals near by along with a fire brigade station so we are constantly inundated with sirens


oh and we have helicopters flying over at least once an hour (police patrols, ambulance choppers) so i think a little exhaust note is probably as loud as a butterfly flapping its winds in a swampy jungle.

[Si.G]

I have recently got a buddyclub spec 2 zorst - pretty much straight through and the noise at low revs is terrible. It sounds like a super loud trombone at about 2000rpm. My car is mainly for sprinting, so it is okay, but I do drive my car on weekends from time to time, even with the extra slot in silencer it is super loud - sounds like a prop aeroplane on the freeway.

I do think that there are gains above 5k which is cool for my sprints and it does quieten down a little and sounds pretty good over 4k.... Definitely revs more freely

BUT - I feel like I cannot drive the car on the street anymore for fear of getting pulled over and I don't want to annoy my neighbours. So I am not enjoying my mx5 the way I should be. I am going to make a bigger better slot in silencer for it so the noise is acceptable for the street and only let it rip in competition.

Personally I would not go for a straight through zorst on a street car, it simply sounds bad below 4k.
Si.