heskiboy-350z Posted February 17, 2013 Share Posted February 17, 2013 Hi, I'm new on here so be nice and help me out please!! I bought a remapped JDM 350z about 3weeks ago, its an absolute beast!! But, it came with a japspeed K1 exhaust, which sounds good when i go fast in town, Sounds @*!# when im going slow, and really sounds @*!# when im on the motorway!!!! I'm toying with the idea to fit manifolds on my car with ether Decats already on the manifolds, or highflow cats.... also i'd up-rate the Y piece that go's to my K1 Catback, then id revert my backbox to its original 350z rear exhaust Can anyone recommend a reasonable manifold set which isn't going to break the bank ive found these on ebay: http://www.ebay.co.uk/itm/310541715407?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 also these: http://www.ebay.co.uk/itm/360592795645?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 I want the power gains, but want a stock/ish sound out the rear HELP IS NEEDED ASAP PLEASE. Quote Link to comment Share on other sites More sharing options...
The Bounty Bar Kid Posted February 17, 2013 Share Posted February 17, 2013 Changing manifold is an engine out job, so that alone could break the budget. Quote Link to comment Share on other sites More sharing options...
Keyser Posted February 17, 2013 Share Posted February 17, 2013 (edited) You do not need to change the manifolds to run de-cats or HFC's. If you do change the manifolds it's a PITA and the best option is to take the engine out, on an N/A Zed most don't think it is worth the effort of changing the manifolds - if you do, then go for something of a good quality and that has been tried before - Stillen would be my preferred option Loads of advice on here about CAT's Zorsts etc have a read around the genral rule is buy cheap - buy twice Edited February 17, 2013 by Keyser Quote Link to comment Share on other sites More sharing options...
The Bounty Bar Kid Posted February 17, 2013 Share Posted February 17, 2013 I really wanna change my manifolds. Can't afford fi so n/a is the way for me. But it just costs so much to get done unless you're doing other stuff as well. Quote Link to comment Share on other sites More sharing options...
heskiboy-350z Posted February 17, 2013 Author Share Posted February 17, 2013 I can imagine that the stock manifolds are really heavy! taking the engine out sounds a pain in the ass, but it would be worth it i guess. i better get some quotes. Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted February 17, 2013 Share Posted February 17, 2013 Id stay well clear of ebay manifolds. You dont want to take the engine out only to have to take it back out a month later when they crack. Like keyser said its not realy worth it on a na engine but if you really want to do it buy a decent set. Oh and welcome to the forum Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted February 17, 2013 Share Posted February 17, 2013 Also ive noticed yhat alot of zeds in the states do the manifolds on na Quote Link to comment Share on other sites More sharing options...
heskiboy-350z Posted February 17, 2013 Author Share Posted February 17, 2013 the first link says that they come with a lifetime guarantee?? which is amazing for £250. i guess if i really want them doing i should wait until i can spend 2k on her Quote Link to comment Share on other sites More sharing options...
Ian Posted February 17, 2013 Share Posted February 17, 2013 I paid around £500 to get mine fitted about 4/5 years ago & that was at mates rates. Hes said that he will never fit another set with the engine in situ Its all well and good them having a lifetime guarantee but will they cover the additional labour that you will need to pay when (which they will) crack Quote Link to comment Share on other sites More sharing options...
FUG Posted February 17, 2013 Share Posted February 17, 2013 Quote Link to comment Share on other sites More sharing options...
GT4 Zed Posted February 17, 2013 Share Posted February 17, 2013 Manifold are worth it except its a pain to fit like its been said before. I had mine installed in about 4hrs unlike the oft stated 6-8hrs. The truck we figured out was to removed the driver side coolant pipes in addition to the steering knuckle. It also help that there where 3 people at it. The only mistake I made was not to get ceramic coated ones or heat wrap it. I've got a new pair which I planned to warp and swap when installing my SC and bits but will be prepared to sell it to divert the cash elsewhere. Quote Link to comment Share on other sites More sharing options...
Dblock Posted February 18, 2013 Share Posted February 18, 2013 The top ones are dc sports copies. They are rougher on the inside and welds aren't as nice but they might be ok. They might break though so it's a chance you have to take. The bottom ones are long tube manifolds. They replace your cats with straight pipes making an mot silly hard as you will have to fit cats somewhere else in the system. The long ones always make the best power though. Quote Link to comment Share on other sites More sharing options...
Sam Mcgoo Posted February 18, 2013 Share Posted February 18, 2013 You could spend the money on some quality HFC or Decats and a good quality cat back exhaust? There are some nice stockish, nice sounding exhausts available that will give some gains (after a re-map) What are your other performance mods? Unless you've already done all the other NA mods, I would leave the manifolds. Quote Link to comment Share on other sites More sharing options...
Karlp Posted February 18, 2013 Share Posted February 18, 2013 My JDM came with stainless steel manifolds and it gives a nice rasp to the exhaust. Im running Decats and a stock exhaust but Im pretty happy with the noise levels. If your planning on running decats, a K1 and a manifold change I think it will be probably too loud! Unless you stick some bungs in the K1??? With your current remap set up Id go for decats and a new y pipe, will improve the drive and sound of your zed. Quote Link to comment Share on other sites More sharing options...
heskiboy-350z Posted February 18, 2013 Author Share Posted February 18, 2013 I wanna kill my k1!!!! It's too loud, makes my car sound like a boy racers crappy corsa...... So what i wanna do is get manifolds, heat wrap them..... fit High flow cats, fit a new Y piece and then fit my standard back box onto the rear. as for mods done so far, its got the K1 catback (bag of poo) and a rev up remap. i want the stock sound with the power levels the same...... i might even get the plenum spacer kit done and another remap with dyno Quote Link to comment Share on other sites More sharing options...
Dblock Posted February 18, 2013 Share Posted February 18, 2013 Most manifolds warrentys ate void by heat wrapping them. I found no real noise difference with manifolds. Quote Link to comment Share on other sites More sharing options...
Tarmac@TarmacSportz Posted February 18, 2013 Share Posted February 18, 2013 Not sure how long your standard back box would last, they struggle to stay alive. I've sold a fair few Stillen headers to the forced induction boys but wouldn't really recommend them otherwise, it's not the right bang for buck mod on the N/A zed. Your best bet is a decat/HFC and a true dual or single exit exhaust. Might need another map though Quote Link to comment Share on other sites More sharing options...
wizard Posted February 19, 2013 Share Posted February 19, 2013 Dude, I'm still running stock manifold on my FI'd zed. Don't bother unless you have money to burn. Agree with a decent exhaust / ypipe and HFC setup. Quote Link to comment Share on other sites More sharing options...
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