1supra

Ive read alot of threads stating there wasnt much performance gain in aftermarket exhaust for the lexus v8s in the gs 430 and gs 460,possibly because they are not true duals? I see the dyno #s posted on the isf a/m exhaust and they seem significant. I know the gs motors are not as performance orientated,or they have been ecu detuned for smooth power?

Im wondering if a exhaust cutout would be more beneficial for this type of car,Dont think many lexus drivers want a loud car.but it would be nice to have a elec cutout you could use for spirited driving once in a while. Where would be the best location to place a cutout with these motors,I know exhaust velocity and backpressure come into play doing things like this in order to achieve the best power?

Stormforge

exhaust cut out? i'm not sure what you mean? are you talking about removing your catalytic converters? that would improve your performance (as long as you don't get caught running without one).

1supra

they are solenoid activated holes usually around 2 to 2.5 inch,you flip a switch in the car and they open.louder but more power.

XxGoKoUxX

no, they will not benefit nor will the idea work. Because you'll blow off CELs like a motherfluffer

besides that fact, we'd probably lose power due to the safety precautions our engines have. Find a way to work around the CELs and you should be good

1supra

not sure I follow,can you explain what you mean here? if they are placed in back of the secondary o2s I dont see how this would cause ecu issues

TWong350

iTrader: (8)

I agree with you here but I don't know what sort of power increases would be realized, if any.

passnu2

iTrader: (33)

basically creates straight pipes with no resonators, mufflers, ect...Sound is amazing on the right car!!!

http://www.youtube.com/watch?v=vkW-A6ffEU4

passnu2

iTrader: (33)

this is a good example of it in action...

http://www.youtube.com/watch?v=m5gaAuGNk5M

patricksr5

I have a Corvette Z06 which has the exhaust flaps that actuate above 3500 rpm. The sound is amazing but not sure I feel a real kick in performance...some but not dramatic.

imadesign

this is what you want
http://www.youtube.com/watch?v=vaucC3AOitc
but you should know where you want to install it,if you need full bypass, install two cut-outs befor the two front cats, be ready for CELs then

XxGoKoUxX

Passnu, did a full exhaust syetem on his vehicle. The car was starving from fuel because it wasn't tuned after the exhaust was done (granted he also added an SRT intake to his vehicle). Driving it, he witnessed CELs blow off saying a bank or two was running lean, that is the reason why I said (from reading his thread), that you need some tuning/a bypass to get anywhere with that. Then again, I could always be wrong. I haven't done this setup myself so I have no say in it.

I doubt any power increase would arise unless the ECU was freed up a little.

lol, that's NO FAIR! A turbocharged car yield infinite performance from being freed up of flow-back. I lost a noticable amount of power on my car when I put the JR exhaust back on my car.

That's one sick sounding 460 engine lol

1supra

Think some info is missing here though,didnt passnu, do a full exhaust and have something done with the second set of 02s different,been a while since I read that thread. alot of the isf cars have full exhaust with a/m headers as well and intakes. They are making more power with out tuning needed. I agree it would make more efficient power if you wanted to add a fuel controller like map ecu or super afc, but tuning a gs is kinda overkill, for what you get in results imho. I like the gs460 for these characters in this order ....its luxury,quite,smooth,nice looking,v8 thats pretty quick. I find that tuning any n/a Toyota after obd2 was employed is a temp fix and a general pita with any picky back comp.Nothing less than a full engine management sytem like motec or the like is worth it.To do that to a GS would be a joke even trying..Im sure these even newer factory ecus would be even worse.

imadesigh...At least we are getting somewhere with this thread now.Thats really good idea have the rpm or boost controlled cutouts,I heard of some supras using that but never drivin one. That gs 460 in the bottom link sounds sick,It looks like he is using manual cutouts with bolt on covers right in front of the mufflers,not sure why he put them way back there or used 2 for that matter since the exh back there isnt dual anymore,possibly for ease of bolting the covers back on. whos car is that,Id like to pm them for their results. I wouldnt use manuals cause i wouldnt drive around for any amount of time sounding like that. but a occasional blast here and there to make people wonder would be fun.

also Id think it wise to either gut out both cats and place the cutouts just in back of the second 02s,this would give you as close to full bypass as possible and keep a stock look for any inspections down the road


dont know about 12s or 400hp but it deff looks faster than mine....http://www.youtube.com/watch?v=KLxHU...eature=related

XxGoKoUxX

Why don't you be the second to do it? I mean, you want it right? Compared to the many modifications that we make on our cars, this should be close to nothing in cost (set you back maybe 300-400?). Before you do it though, get a dyno, and let us know how it goes!

passnu2

iTrader: (33)

First my car ran just fine wit my custom, true dual exhaust, and it eliminated the secondary cats.

front coming from your headers:


X area:


all the way back:



FYI - AWD members a local purchased this and modified the pipes to get around the extra drive axle and has been running for over a year now


The SRT pipe does fit and work! The MAF will not correct for the larger volume of air so you will run lean in bank 1 & 2. You can get a tune from SRT or get a piggy back.






If you want a pipe/intake that wont throw a code and not take in more air then your oem then this works since I tested it out...

passnu2

iTrader: (33)

on those cut outs on the GS they wont do anything in that location. they need to be just after your primary cats and yes you will throw a code on this car if you install them correctly