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The rear deck is 2 Pioneer 6 x 9, they replaced the Bose 6 x 9 that were back there from the factory. All 4 Bose speakers from the factory, 2-door and 2-rear deck, each had their own built in amps. To me, the rear speakers are just there for fill and the focus should be on the front...

I'm currently re-doing the system in my '89 Cadillac Fleetwood. This will comprise of 2-dash, 2-front door, 2-reardeck and 1-Sub. The dash and rear deck will be powered by the head unit. The front doors and Sub from a 4 x 50 Boss amp. The front doors are the factory Bose units. I...

OOpps, double post.

I'm trying to find out what off brands perform well. Boss, Phoenix Gold, AudioBahn, Phase Linear....etc. Some of these work great, have the same features as name brand stuff for a fraction of the price. I went crazy many years ago with Orion, Kicker, Infinity and probably some others, spent...

400hp N/A sounds like a high rpm screamer. If no FI what are your plans? A header's design is always a compromise and tuned for a rev range.

The ID of the exhaust ports are around 1 1/2" IIRC. Anything larger might only help at high rpms, maybe. Sometimes too large of a headpipe can cause turbulence and restrict flow killing performance. As with most things, the right size is better than too much or too little.

How high do you intend to rev this? The lower the rev range the longer the primaries, usually.

I'm sure JBrady will be here to assist very soon. Depends on where you want the best power to be and if you are going to recognize OEM redline.

Wow, those look great. Much more the dimensions I'd expect for this motor, long equal length primaries. Larger diameter than I expected but if your in the 600hp neighborhood at those rpms they're probably right on. Sound clip when done sure would be nice.

Six-bolt mains, Aye Caramba! Are the engines in the GS300/SC300/RX300 all the same engine? Thanks for all the info and replies, this is just for my amusement and comparison sake. I find it interesting how some items are kept the same for an entire brand of engine while some items are unique...

So bore/stroke is different and so are the valves and pistons?

I'm simply curious. I don't see any need for there to be a difference just because one is a six and the other an eight. Is bore and stroke the same for the 300/400? I can't see why the valves would need to be different or even the pistons.

Name: Chris Rank: Specialist Branch: U.S. Army MOS: 29F Fixed Station COMSEC repair Years of Service: 4 Massweiler, West Germany June 87-June 89 63rd Signal Battalion Ft. Bragg, NC June 89-August 90 1112th Signal Battalion Got out just ahead of stoploss. 82nd Airborne Division area...

Where does Lexus use this? Ya got any pics?

Is there some sort of oil-to-coolant heat exchanger? This is mostly to keep oil and coolant closer in temp to each other. This also seems to help if coolant temps start to rise faster than the oil as there is more medium to absorb and spread out the heat. Typically you won't be making max...

I did not expect the compression to be as high as 10.5:1. Factory timing may already be rather mild so if the ECU retards even further to compensate for 87octane it may venture into the less efficiency realm. 89 octane isn't too bad, doesn't have as much crap as the higher octane "pump" fuels...

Turbulence is a real killer. If you cut the "nozzle cut" on the two pipes that are merging they won't sit flush to each other except at the tip. Is it better to make the typical merge cut and then weld in the "nozzle divider" piece? Or do you just flatten the squared off edge so they sit...

Good info. Please don't confuse my comments or misunderstandings with not believing you. Exhaust is definately one category that almost every idea I had prior to testing worked or sounded completely different than expected. The area I have been worried about as I have designed my two systems...

Ok, I get it now. So it does get smaller just before the merge? Does this actually work or are you in the R&D phase? The two merge designs I have made are splayed style instead of the parallel style as above but I guess it doesn't matter reallly. The design program, PipeMax, do you input...

I'm making a jig to cut a 15 degree angle off the end of both primaries so as to attain the 30 degree included angle when joined. Make another drawing if you can, I still don't really see what you are trying to show us.