A.H

iTrader: (20)

I don't get it. Why do you have so much rasp and infinite doesn't with the same setup? I barely have any rasp and I have test pipes....

Changvi

iTrader: (66)

I really like the flow of the TP, but i just cannot stand the smell anymore. It is very annoying. On top of that, the noise is also unbearable when i start the car in the morning while my family is asleep. Not to mention the rasp when i WOT above 3k rpm........ What i have heard about Berk HFC was they have the tendency to crack within 1 year at the support bracket area, which, caused a major leak to one of the member's ride on the forum. It also melted the flow sensor as well. My friend has a Stillen HFC, and boy, I was impressed with the sound the power.

https://my350z.com/forum/intake-exha...berk-hfcs.html..... read it through and you will know about the OP's experience.
https://my350z.com/forum/intake-exha...esitation.html

KS0385

iTrader: (2)

Fast Intentions has some very good HFC's for $500. I have em on my car and it sounds fantastic. No rasp and no smell.

https://my350z.com/forum/engine/3926...iday-sale.html

infinite

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In my car...

A.H

iTrader: (20)

Infinite, your car sounds awsome, retains the VQ sound, and has no rasp that I can hear. So question is what happened with the OP's system..?

GHOST1207

iTrader: (23)

Sounds nice! Any WOT vids?

infinite

not from inside the car yet. I have this video. To eliminate the rasp, I used two 03-05 g35 cat gaskets (paper type) from Autozone. I then bored them out using my trusty die grinder so the opening is larger than stock. You must modify stock gaskets, since the bassani and stillen hfcs are more open than stock. My theory is the paper gaskets seal off better, since it modes itself upon pressure, transfers less vibration and sound. If you look look at the internal piping of the stillen hfcs and bassani, they don't exactly line up to their own flanges, so you must line it up from the pipes not the flanges.

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hiz-n-herz

iTrader: (11)

Oh thanks... rub it in

I wish my car sounded like that. I also have some pretty loud resonance frequencies at about 2000-2200 RPMs.

It's weird but my rasp quiets down just a bit when the car has been run on the highway and everything's nice and hot. It's still obvious, but a little less so.

Thankfully though I have ZERO drone on the highway. It's actually really quiet for highway cruising - total surprise. Downshift into 5th and floor it though, and anyone within a mile behind you knows you're gettin on it.

Hopefully I'll have time next week to have them mess with it. We'll see. I'll update this thread with any updates.

I would like to hear a WOT run to redline from inside your car.

infinite

Here's a link to the gasket I used...
http://www.autozone.com/R,719325/veh...ductDetail.htm

You'll need a grinder to make the opening slightly larger. It will take away that rasp you have. They only cost 3.99 each. The material aborbs vibration and rasp that results from metal on metal.

infinite

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A.H

iTrader: (20)

Damn that goes through the RPM's so freakin fast!! Good work. I wonder if that gasket really helped rasp though. OP should try it out, for 4 bucks you can't go wrong

Cali-Darkness

iTrader: (35)

Paper gaskets blow out under hard driving conditions. Cant the same be achieved out of the metal gasket using a dremel tool? In order to get the metal gasket to mold back up after it has been used is to heat it slightly with a torch. This helps it soften enough to form back to the proper exhaust sealing shape. Most exhaust shops do this when putting the old metal gaskets back on

hiz-n-herz

iTrader: (11)

It looked to me like he lost traction in 1st on the first run. It's easy to do with this new found power.

Thanks for the vids!

infinite

that's exactly what happened

hiz-n-herz

iTrader: (11)

Wel, I took a look at the exhaust today at a friend's house. The pipes were not perfectly centered so I centered them (cat/x-pipe flange fittings). The shop had bored out the metal gaskets nicely to 2.6" diameter so I left them in, but it's still really raspy.

I did find an exhaust leak or 3. not sure if that would cause rasp though.

One end of the x-pipe bolts to the flanges from the cats. The other other end of the x-pipe has slip-fittings with clamps where the mid-pipes slide in. When the car was up on jacks and I would rev the engine, water (from condensation) was coming out of the slip-fitting areas, a little bit on the driver's side, but on the passenger's-side I could see water droplets spray from the clamp area out as my friend reved the engine. Also, where the driver's side mid-pipe has a slip-fitting into the pipe by the muffler was leaking quite a bit of water.

So my question is, would a slight exhaust leak cause rasp? I did not bother with the paper gaskets since it was getting dark and I had not bored them out yet. Maybe I'll try those another time.

Still love the power these mods make, but I gotta quiet down the rasp somehow. I'll update with pics of the "leaks" later tonight.

I tried to loosen the bolts to adjust, but without an impact wrence, I could not budge them. I'll have the shop look at them when I take it down next.

hiz-n-herz

iTrader: (11)

here are the pics of what seems to be exhaust leaks. Not sure what to do about leaky slip fittings other than having them welded. Also, not sure if these leaks can contribute to the rasp I am hearing.













Water (from condensation) leaking from x-pipe slip-fittings:











Water leaking from driver's side rear slip-fitting... splashed all over the jack too:


Not much clearance between the driver's side mid-pipe and the W-brace. I wonder if this is causing some of the NVH I am feeling? The engine can deflect a bit under hard acceleration.

infinite

You should have atleast a 1/4" clearance between the mid pipes and the W brace. If you feel any vibration beneath, loosen the clamps on that driver side mid pipe a little and use the jack to push that pipe up a bit and tighten the clamps up. It should raise it and give you more space between the mid pipe and W brace.

The leak points might just take a while to seal up. Normally exhaust leaks relate to hissing sounds, not rasp, unless it's at the flanges.

whoopazz1

iTrader: (6)

I had water leaks as well, so I just tightened the F*ck out of the clamps and all is good.!!! that seems like a lot of water comming out

zettahertz

dang that's a lot of water, i hope i dun have a leak now. (lost like 2mpg, while i read a few other ppl gained mpg under same driving ). I think the clamps works a bit better when they're closer to the edge. I see a few cm of space in some of the pics between the edge of the pipe and the clamps. And is there clearance from the sway bar on the right pipe, hard to tell from those pics, looks like it's touching or it's really close too.

singh

iTrader: (2)

Ummm...that much water leaking is not normal!

Something is definitely wrong with the fittings..there should not be any water leaking..