juanmedina

here is a video of my car with the modified exhaust. I reduced the drone significantly by attaching the weight that was on the muffler on the street side to the straight pipe with an exhaust clamp. I also added a little bit of sound deadening; it sound awesome and the car is really quite when cruising around town. I love it

ISFPOWER

iTrader: (20)

can you explain better?

neweyslex

iTrader: (2)

Yes, please explain this a little further.

Jowett

It's an exhaust damper weight, it prevents resonance/drone at a particular frequency.

juanmedina

If you look at the stock exhaust you will see that there is weight attached to the muffler on the driver side. You can see that the driver side pipe length is also longer; therefore there is more resonance than on the passenger side. To help with that annoying frequency Lexus added a damper weight.

What I did was removed the weight from the stock muffler and I attached to my straight pipe using a muffler clamp. I also added Home Depot sound deadening under the head shields and wrapped some heat wrap only on the driver side pipe. It seems that wrapping pipes also help resonance.

I been running this setup for maybe 3 months and I kill the drone completely at 2000rpm. It sounds awesome and even my wife likes it. Best mod I ever done, no drone

neweyslex

iTrader: (2)

Got it. Thank you. Very clever by the way.. What is the brand of the Home Depot sound deadening material?

MisterSkiz

iTrader: (2)

I always thought that weight thing was to stop the exhaust from hitting the underside of the car.

cremaster

iTrader: (1)

wow, had no freakin idea what that weight was even for! haha

juanmedina

This is the stuff that I got. I was a little worried about the melting temperature but is high enough to not be an issue with straight pipes. The is no odor inside the car since I installed the Peel & Seal outside the car and a little bit on the truck area. I only used like 1/4 of the roll.

MisterSkiz

iTrader: (2)

When you guys had this done (straight pipe the second set of cats), did they have to pull the exhaust off the car?

The places that I would go to are small independent Mexican immigrant owned, and I really would not like to have them pulling the rear 02 sensors off to do their work, but not sure how they would weld in a pipe without pulling the exhaust off the car.

cremaster

iTrader: (1)

when i switched out my borla for my current set up, i had the OEM y-pipe installed first. from there my exhaust shop cut off the oem middle resonator, then welded on a fabricated smaller y-pipe, the hanger, then the straight pipes and rear hangers, all while the whole thing was on the car. also when i had my middle resonator removed from my previous borla, the exhaust shop just hacked it off while the entire system remained on the car. so, i don't think your shop will need to remove the entire thing.

MisterSkiz

iTrader: (2)

I went today and had my secondary cats removed...Cost me $80 bucks.

I made them spray the welds with hi temp paint as well to avoid rust, as I drive through snow/salt.

I will say the car seems to pull harder in the upper rev range, but it could all be in my head.

For 80 bux, whatever....maybe in the future when we have a good way of spoofing the rear 02 sensors, I'll clear out on front cats too.

I kept the mufflers, as the car is my daily driver.

VtotheJ

iTrader: (2)

^Any sound difference misterskiz?

juanmedina

I dd my car and I have no muffler there car is actually really tame. In my opinion it sounds almost like stock while cruising, I didn't have adjust my radio volume because it is probably only a few DB louder. My wife hates loud exhaust and she cannot believe how quite my car is without mufflers.

MisterSkiz

iTrader: (2)

I didn't notice any, however my neighbor who is a car guy asked me if I did something different because he said my car sounded meaner on cold starts.....