Bakkums

Thanks for all the reactions. Think I'll go for the motordyne HFC with test pipes. Quote: But here's the kicker. The 2.0" test pipes made 2 more HP than the 2.5" test pipes! ...It left me thinking "COOL. Smaller diameter test pipes make more TQ and more HP. That's a wining combination!" So sombody a long time ago probably misinterpreted the smaller diameter as adding performance by being more restrictive. But this is not the case. It is because of increased scavenging. Smaller diameter pipes near the engine increase the velocity of the shockwave and thereby increasing the effect of scavenging. It was a misinterpretation of the results. So I continued down this line of testing at the Y-pipe primaries. Using the 2.0" test pipes, I then tested various Y-pipe primary diameters. 2.0", 2.25" and 2.5". The expectation was to see similar results... but not quite this time. At least not at the Y-pipe. The 2.0" Y-pipe primaries did indeed provide the highest TQ, but it brought a good portion of the HP down. 2.25" primaries were better but could still be improved upon. The 2.5" Y-pipe primaries provided the best peak power and the best average power.

Thanks for the input. I know it isn't a 1 on 1 comparison when it isn't the same car with the same other specs. But it can give an indication. I didn't saw the comment from Mark, but I will contact the tuners directly. Thought it would be nice for the other 350z drivers to know what's the "best" option.

Hey Mark, Thanks for the info, I'll Lett you know what I'm going to do.

Are there people with the motordyne y-pipe with HFC and had the car on the dyno? Maybe we can compare these with a dyno chart with HFC front pipes. I've read the motordyne test but they didn't test this I think. Would be a nice input for them and us off course.

Is it still possible to buy the uprev tuner? And what will it cost shipped to the Netherlands?

It is not normal that en exhaust is rubbing against the car. Are your cats original or do you've got aftermarket ones? Maybe there is the problem. Otherwise I would screw everything lose and try to fit it correctly. PS. Engine mounts are still ok?

Anybody knows the physics and can tell me what the best option is? Also the exhaust manifold and ypipe back will be changed.

Hello, I'm searching for the best option regarding the exhaust and performance. I think the following options are available: 1) Hfc front pipe with open/resonated y-pipe 2) test/resonated test pipes with hfc y-pipe I will need a car with hfc so I can drive the car without having mot problems, on the other hand I want the most performance. My thoughts were hfc front pipe is the best option, because the flow must be equal trough the exhaust from front till back or am I wrong? This has something to do with backpressure on a na tuned car. I've read that a bigger exhaust will perform less at some point. Hope you guys have some good tips and maybe proof of the best option ☺ Thanks for al the help. Regards Martijn

Received the emblems in good condition. Will post some pics when they are fitted. Edited: Picture attached, thanks. Only the back isn't fitted yet.

Are these still for sale? Would like to buy 2 emblems and shipped to the Netherlands.