Mandrel bent X-Over? Mandrel Downpipe? (feeler thread)

[god910]

Get a reducer.  Make it work.  Then upgrade, and take out the reducer.

[90TGP]

What kind of power gains did you see with the downpipe? [I remember a year ago when you first made it you were estimating $250+ for a downpipe :shock: ]

How hard would it be to install?

[dbtk2]

What kind of power gains did you see with the downpipe? [I remember a year ago when you first made it you were estimating $250+ for a downpipe :shock: ]

How hard would it be to install?

It shouldn't be too difficult.  It is just a few bolts.  However, getting to them will be the problem, and getting it to come off if it has been connected for the last 14 years.

I would think the gains would be pretty good assuming the rest of the exhaust flowed good (basically a 2.5" exhaust with high flow cat/no cat, and good flowing mufflers).  I am hoping to use the downpipe to help me pull off a 13.999 this year.  I am going to try and see if I can do it on the stock turbo...that is the goal.

Shawn

[RedZMonte]

1.75" Mandrel bent X-over w/ ss braided flexes $375 Shipped +stock x-over
2.5" mandrel downpipe With SS Braided flex. $155US Shipped

shane

That crossover price is the same if we provide a different flange for the turbo, correct?

I am very interested....when I get the $ I will definately buy!

Thanks,

Shawn

yes, i need the stock x-over sent to me with the payment so that i can use the flanges off the stock x-over because they are not standard T25 flanges.

[RedZMonte]

1.75" Mandrel bent X-over w/ ss braided flexes $375 Shipped +stock x-over
2.5" mandrel downpipe With SS Braided flex. $155US Shipped

shane

i'm definately interested in the downpipe.  do you need the old downpipe?

no, it is a full new downpipe. As i stated previously i have the flanges for the downpipe. and the downpipe will have to be professionaly installed.

[RedZMonte]

Another question...

The downpipe...will it still bolt up to the stock exhaust even though the downpipe is 2.5 & the exhaust is 2.25"? (so I can use my stock exhaust until I can get it upgraded) Or is it 2.5" and I have to get a 2.5" exhaust to bolt to it?  And, if it will fit a 2.25", it will still fit a 2.5" also???  I just want to make sure this will work how I want it to.

Thanks,

Shawn

it will be flanged. so you will have to get it professionally installed. they will make it fit to the stock cat and catback. as you see in my pics i have a flange welded to my stock cat. then i gutted my cat. so the answer is yes, it will fit the stock exhaust but it needs to be professionally installed.

[RedZMonte]

the downpipe is only the pipe. it does not include a cat. Just to clear things up.

[Invasion1]

Looks Awesome

I would be in for a 2.5 Downpipe or if a 3 inch will fit and your considering making them i would take that over a 2.5

but im in for a downpipe regardless

I have a few questions about the crossover though

I will PM you

thanks REDZ

Dave

[TGPilot]

I am kinda curious to know how you figure a larger downpipe will benefit on a stock T25 turbo setup? There is so much backpressure in the system it is sad...but putting a larger diameter exhaust pipe on after the T25 exhaust fan (turbo drive) really wouldn't seem to benefit. Now with a T3 or T4 turbo I could see major gains over the stock exhaust ID" going up to 3" all the way back... 8)

[RedZMonte]

when it comes to turbo's the more you can open up the exhaust system and let gasses out of the turbo you will allways benifit. the faster you can get gasses out of the turbo the faster it will allow gasses to travel into the turbo, resuling in faster spoolup and better the gasses will flow at high rpm's.

RedZ

[RareGMFan]

What's the largest anyone has gone on the exhaust all the way through on a TGP?  Would 3" be too much?

[twinturbosedan]

What's the largest anyone has gone on the exhaust all the way through on a TGP?  Would 3" be too much?

the biggest i have heard of was 3", but that was on eclipse5302's '91 Cutlass Sedan with a TGP engine.  you can see pics of it at http://www.turboste.com  i am wondering if he had boost creep problems using such a big exhaust with a small turbo?

[Invasion1]

I have spoke to him a few times about Swap related stuff and he never mentioned anything bad about his fully 3' Exhaust set-up.

[Jeff M]

when it comes to turbo's the more you can open up the exhaust system and let gasses out of the turbo you will allways benifit. the faster you can get gasses out of the turbo the faster it will allow gasses to travel into the turbo, resuling in faster spoolup and better the gasses will flow at high rpm's.

RedZ

Hows it going RedZ 8) .  Got to say that going that big will hurt performance for the fact you lose exhaust gas velocity :cry: , not a good idea like welding mild steel to stainless.  3 inch is too big for a T25, T28 or some T3s.  I have a T70 turbo on my truck and on the dyno going from a 2 ? downpipe to a 3 inch down pipe netted only a 3% gain in hp :roll: , but that is a much bigger turbo than these.  It also depends on the length of the exhaust system, if it were shorter you could get away with bigger, but adding mufflers and cats changes that as well.  And before anyone bites on that cat :lol:   , tests have shown very little hp loss from a stock cat, upgraded ones are the best if you have to hate your :snipersmile: cat.

Jeff M

[RedZMonte]

i now have everything i need. I can make the downpipes and Mandrel x-overs if anyone is interested.