im planning to spend $500 this month.im torn between the ams big mouth dp and the perrin dp with cats, almost at the same price range.guys, which do you prefer?
something good for that amount of money that makes more power between the two and will not cause cel or throw codes.

mods list:
hks ic pipes
hks reloaded suction intake
hks ssqv recirculated
hks hi power exhaust
ams ic
cobb ap (not installed yet)
aem uego, boost, pressure (not installed yet)

 

You should understand the differences between these two products before you even decide to purchase.

The AMS downpipe replaces the stock O2 housing with a cast housing specifically designed for maximum flow. The Perrin pipe keeps the stock housing in tact. +1 for the AMS downpipe.

For the same price, the Perrin pipe is also a catted "test-pipe" and replaces the stock cat with a high flow version in a 3" diameter. +1 for Perrin.

However, both pieces are high quality, and obviously neither will cause any trouble codes.

I hope that helps. It's not wise to let other people make decisions for you. If you're into maximum performance, I'd get the AMS piece as it will net you more gains. For cost effectiveness (both a downpipe and a test pipe), the Perrin product.

 

Both companies are great. I went with Perrin's dp and hfc. Go for whatever is cheaper between the two and make sure it's stainless.

 

Really good advice...

 

Hey times are tough! No brand exhaust is going to make significant power over another brand. Eliminating the restrictive cat is the only thing will make a significant difference. The larger o2 housing is a good option too but a very small gain.

 

In this case, the Perrin product is a 2-in-1 so what you're saying isn't good advice. The best economical decision would be to get the Perrin, since you'd need to purchase a test pipe with the AMS downpipe to get an equivalent setup.

 

thanks.i was looking for opinion which is better between the two. if i go with ams,is it still advisable to get the hfc to get its full potential as a tbe? on the other hand perrin is already complete. . will go for power now for best result.

 

The Perrin product alone will perform better simply because it is also replacing the stock cat and 2.5" piping. Yes, you'd need a catted test pipe with the AMS downpipe in order to see equivalent gains.

Comparing downpipe-to-downpipe, ignoring the cat feature of the Perrin, the AMS downpipe is better, though marginally. I don't think any dyno tests would be conclusive due to how minute the difference is, but it's obvious there is a little to be gained with the stock O2 housing replacement.

 

I went with the Perrin setup because it's cheaper. Buying the cheaper exhaust is still my best advice to give. I don't think you can go wrong either way but I'd recommend the cheaper Perrin setup if it's a daily driver.

 

Interesting.....

 

Buy down pipe from AMS for sure, But do not buy test pipe from AMS! Way too expensive..
Some parts from AMS is really worth the money but some parts even I know they are hand made still doesn't make any different compare to other manufactures..
Oh but away I got HKS HighPowerExhaust too
How much did you pay for it?!

 

$600 shipped.but i bought also the ssqv.thats why i got that price and waited for 3weeks for it was back order.it was worth the wait though

 

Not true at all. The O2 housing is the second most restrictive peice in the exhaust besides the cat. Just ask AMS....


As for the decision between the two....well, you are talking about different peices so it's hard to give you advice. For now, both peices should net you about the same power if you were to only replace one of them. In the future though, the AMS downpipe with a test pipe will be the clear winner. You don't have much future plans with the Perrin, it is an al in one peice that would need to totally be replaced in order to upgrade either the downpipe or to a test pipe.

 

I agree but the small gain you might get from a larger o2 housing is not worth the extra money. The Perrin setup is a better deal.

 

The Perrin setup keeps the stock O2 housing, while making the downpipe section and cat pipe one piece. The downpipe section itself has been proven to make zero hp and the only gains you'd see would be from the high flow cat. If you wanted to swap to a test pipe for more gains, that would be impossble since it's all one piece.

The AMS unit replaces the O2 housing and downpipe in one piece. This has been proven to make ~15whp plus whatever gains you'd see from a high flow cat or test pipe.

Replacing the stock O2 housing and downpipe with a one piece O2 downpipe is the way to go.